CONTROL CHART BASICS and the X-BAR AND R CHART +++++ EXAMPLE

No video

CONTROL CHART BASICS and the X-BAR AND R CHART +++++ EXAMPLE

Рет қаралды 164,088

CQE Academy

Күн бұрын

Пікірлер: 215

@_M_D_M_ 3 жыл бұрын

Shut down all other videos on KZfaq for Xbar-R Charts. This is enough. Gold Standard. May the force be with you.

@CQEAcademy 3 жыл бұрын

THANKS!!!!

@EmanFahmi-84 2 жыл бұрын

Actually, and without exaggeration, you are the best tutor I have ever seen explaining TQM & Six Sigma, May Allah bless you. A bunch of thanks, Sir.

@CQEAcademy 2 жыл бұрын

Wow, thank you so much Iman!!! I am extremely blessed, and I want to be a blessing to others!

@muhammadsheheryar7304 21 күн бұрын

Wow! I have been trying to understand this concept for so long. I have referred to so many articles and videos. I wish I had found this sooner. I finally understand it. Great job!

@anniem824 3 ай бұрын

I have struggled with this concept for a while, and now get the basics to move forward again. Thank you!

@CQEAcademy Ай бұрын

Glad it was helpful!

@ashb3390 2 жыл бұрын

Thank you! I’m currently studying six sigma and this has helped me understand the components of the xbar and r chart. Showing a step by step explanations with visuals has helped me so much!

@CQEAcademy 2 жыл бұрын

Hey Ash, I'm glad the video was helpful!!!!

@ZenbeworkGirma 10 ай бұрын

this is amazing that I was struggling for 2 weeks on this topic and you video simplify it. love it

@navjotsingh2251 3 жыл бұрын

Thank you so much! There's a reason why you have no dislikes on this video, because you're awesome!!!

@CQEAcademy 3 жыл бұрын

wow, thanks so much!!!! I appreciate the awesome feedback!

@TheEngineeringToolboxChannel Жыл бұрын

Great video! Love seeing someone who really understands this teaching it. Too many people on youtube are just slapping +/- 3x the global standard deviation on their line charts and calling it a control chart.

@jerrychen8715 Жыл бұрын

Does that +/-3x global stv still senstive enough to capture the abnormal signal? what is the pro and cons for those 2 methods?

@TheEngineeringToolboxChannel 24 күн бұрын

Global standard deviation is far less sensitive to special causes because it includes ALL variations ALL AT ONCE with no regard to time in its calculation. This includes special cause variations which tends to heavily skew your limits. The entire purpose of a control chart and its calculations is to identify significant differences between short term (within subgroup) and long term (between subgroup) variation. For a stable process you would expect the short term outputs of a process to be the about same as the long term outputs.

@mercerconsulting9728 Жыл бұрын

I teach LSS certification classes, and this video is worth sharing with my students becuase it is so clear, consise, and easy to follow.

@greenbeltacademy Жыл бұрын

Thanks so much!

@annastayinathome4495 8 ай бұрын

Hello Sir! I missed a lecture in my undergraduate studies and you saved my exam score! Your method of explanation is so simple and yet comprehensive. I cannot thank you enough. Your work has helped many people, may you be blessed.

@suthashenyperumal5352 Жыл бұрын

I managed to learn about X bar R chart fast and clearly. Thanks for the great teaching!

@greenbeltacademy Жыл бұрын

You're absolutely welcome!!!!

@thishaniholdenberg9086 Жыл бұрын

you explain right to the point, the exact points we need, Its a huge help for students who come across these modules among other science subjects and has no basic knowledge, Thank you !👏

@CQEAcademy Жыл бұрын

You're absolutely welcome!!!!

@rodolfoallpas5527 Жыл бұрын

Man, this is amazing information, I just got a bunch of information that was explained to me in a 3 weeks course, and you explained it so smooth!!! Thanks for your content, sir!!

@CQEAcademy Жыл бұрын

You're absolutely welcome Rodolfo, and thanks so much for the great feedback and positive comment!

@kelvinWambua-tn3kc 3 ай бұрын

Helpful. In kenya, we say, "Asante kwa kazi nzuri."

@banpong1228 2 жыл бұрын

Your VDO is very crystal clear short but sharp! Thanks from Thailand

@CQEAcademy 2 жыл бұрын

You're welcome!!!!

@devanshusharma4926 Жыл бұрын

Really Loved Your Explanation : )👌👌👌

@CQEAcademy Жыл бұрын

Thanks so much Devanshu!!

@fayadali6722 8 ай бұрын

Hello Sir. I just wanted to thank you so much for taking the time to produce these KZfaq videos. Your method and style of teaching helped me pass my ASQ-CQA exam yesterday. Thank you, Thank you!

@jesivy5648 11 ай бұрын

Very helpful for me eventhough i have bad english, THANK YOU SO MUCH❤️

@CQEAcademy 11 ай бұрын

You're welcome!!

@jacqueshollands5630 Жыл бұрын

Best video on this topic on KZfaq

@CQEAcademy Жыл бұрын

Wow, thanks Jacques!!!

@reynardvandergrijp2681 2 жыл бұрын

Best explanation I have found, thanks a lot

@greenbeltacademy 2 жыл бұрын

Wow, thanks Reynard!!!

@naveenasamarakkody8012 Жыл бұрын

Thank you so much! This video saved my day.

@CQEAcademy Жыл бұрын

Wow thanks Naveena, I'm glad you enjoyed it!! And thanks for the comment!

@divinepaddy2032 2 жыл бұрын

Thank you for clearly explaining the critical acceptance of defect rate per type of product.

@CQEAcademy 2 жыл бұрын

You're welcome!!!

@yassonana7697 Жыл бұрын

Thank you I really needed this for my work .This was very helpful

@greenbeltacademy Жыл бұрын

You're welcome!

@lizzy6805 2 жыл бұрын

Very helpful video. Thank you CQE Academy.

@CQEAcademy 2 жыл бұрын

You're welcome Lizzy!!!!

@Absurd-Indian-Guy 9 ай бұрын

I have a quiz today and I randomly came across your video. This helped me grasp the concept entirely. Thank you so much. Subscribing!

@yvettesalgado1081 2 жыл бұрын

So much helpful then my textbook for my upcoming exam! Thank you for taking your time ! 🙏🏻

@CQEAcademy 2 жыл бұрын

Thank Yvette!!! You're absolutely welcome, I'm just glad I was able to help you!

@mishras.k.2896 11 ай бұрын

In the last slide for X Bar chart I think the lower line 3.9 value should be rename as LCL not UCL. But very fine analysis.

@CQEAcademy 11 ай бұрын

Great catch, and you're correct, thank you though!!

@alanthomson477 2 жыл бұрын

Great vid. Has really helped me to understand the process. Thanks

@CQEAcademy 2 жыл бұрын

You're welcome Alan!

@sakhumziklassen2742 3 ай бұрын

Great video, nice and straight to the point. Thank you 😃

@CQEAcademy Ай бұрын

Thank you!

@mubashartariq4521 Жыл бұрын

Effectively explained

@greenbeltacademy Жыл бұрын

Thanks so much!!!

@sonandpets1215 2 жыл бұрын

Thank you so much for sharing your knowledge Sir! I received my B.S. in Chemical Engineering in Mexico a few years back. I am a naturalized American citizen now. What are the requisites to apply for the CQE exam? I'd really like to enroll in your academy. I enjoy your videos a lot but more importantly the way you teach is very easy to understand.

@CQEAcademy 2 жыл бұрын

Hey There!! I'm glad you enjoyed that video! Okay about the requirements to sit for the exam, check out this video: kzfaq.info/get/bejne/p7Z8etiJvra8hX0.html And then to join the academy, check out this free course: cqeacademy.teachable.com/p/top-10-topics That free course will also come with details about the full course - The CQE Master Class

@likkileaks7590 3 ай бұрын

i am from india this helped me very much for my exam tomorrow thank you very much....

@ravindrajoshi78 3 ай бұрын

Excellent !! great , Thank you!! do you have all the formulas sheet for calculating control charts values

@arnowaszink5589 11 ай бұрын

Very helpfull, easy to follow!

@CQEAcademy 11 ай бұрын

You're welcome!!!

@ohheydarciemae1121 2 жыл бұрын

I studied this in college and didn't understand it. Man, I wish this video was available to me back then!

@CQEAcademy 2 жыл бұрын

Thanks Darcie!!!!

@kaneki4403 2 жыл бұрын

thanks for clearing it up. also i'm your 1000th like 👍

@andyrobertson566 2 жыл бұрын

Awesome, thanks Kaneki!!

@chongkl534 2 жыл бұрын

I have a few questions, I hope that you can help me. 1) How about for subgroup more than 25? 2) Can I calculate the UCL and LCL myself without referring to the constant? especially for big subgroup. 3) I have different orders for a product (mean same setting but different manufacturing date with different batches of raw material), each order with certain number of jumbo rolls, each jumbo rolls will be checked at certain meter length, each meter length will be checked several position from left to right. Should I consider all result is 1 jumbo roll as 1 subgroup and all result in 1 order as 1 subgroup. 4) If we do not use software and only excel, how should we monitor the control chart as we need to calculate the mean, UCL and LCL very frequent?

@CQEAcademy 2 жыл бұрын

Hey Chong! For question #1, most tables stop at 25. . I tried to google it but couldn't find anything larger. Honestly, after 25 samples, you should stop using the range value and start using the standard deviation (X-bar and S chart). That transition to the S chart usually happens around 10 samples. For #2, no, you need to constants to calculate the UCL and LCL. You might not need the table I guess if you have the constants memorized. For #3, the question here is all about rational subgrouping, and you want to minimize the variation within a sub-group. I doubt you could argue that all of the measurements on a single roll are 1 rational subgroup. It seems more rationale that whenever you take multiple samples at each meter in length, those measurements would be considered a single rational subgroup. Honestly without knowing your process better it's hard to say what a rational subgroup is. #4, there are excel spreadsheets to perform all of the control chart calculations (UCL, LCL, etc), all you have to do is type in the measurement data

@sunnyteo7052 2 жыл бұрын

Thank you for sharing and very clear explanination on setting up the UCL & LCL. How frequent do we need to review and recalculate the Control Limit?

@andyrobertson566 2 жыл бұрын

Hey Sunny! That honestly depends on your process, and how stable and mature it is, and there is no hard and fast rule. If you go-live with a control chart and your process appears to be stable over time, then that re-calculation does not have to happen that often. If you go-live and your process is not stable, you can do both - address those sources of special cause variation, and re-calculate your control limits. But do make sure not to include any OOC (Out Of Control) data points when calculating those control limits.

@pop-saiyan1193 2 жыл бұрын

You a star, thank u...I loved the simplicity, thanks man

@CQEAcademy 2 жыл бұрын

Thanks!

@amsyarfahmi4565 3 жыл бұрын

Good explanation. Thank you andy.

@CQEAcademy 3 жыл бұрын

You're welcome Amsyar!

@theronaldo84 3 жыл бұрын

Well explained, thank you

@CQEAcademy 3 жыл бұрын

Glad you enjoyed it! -Andy

@tammyd.454 Жыл бұрын

This is a lifesaver, my friend!!!!! Fantastic! Thank you so much.

@CQEAcademy Жыл бұрын

You're welcome Tammy!!!

@lukasdebus248 2 жыл бұрын

Thank you so much for the great explanation! Really saved me the trouble of understanding my prof's terrible slides xD

@CQEAcademy 2 жыл бұрын

hahahaha, you're welcome!!!

@nkulentuli1626 10 ай бұрын

Thank you so much for this much needed video, gained a much better understanding 👍🏾 appreciate your help

@m.balasundarammannu8459 Жыл бұрын

Thanks for this video.

@CQEAcademy Жыл бұрын

You're welcome!

@danielhabteyes8327 3 жыл бұрын

Great tutorial! Thank you Andy.

@CQEAcademy 3 жыл бұрын

Thanks! I'm glad you liked it!

@dsavkay 3 ай бұрын

Amazing content thanks!

@CQEAcademy Ай бұрын

Thank you!

@manikandansrinivasan9816 2 жыл бұрын

Sir, how did you find the A2 value? What is the formula behind it?

@CQEAcademy Жыл бұрын

Hey Manikandan!! I love this question - they actually can be derived from the d2 values, and sample sizes.

@colouroflife5504 9 ай бұрын

Simplest explanation. Thankyou. You save me.

@akanksharai1366 3 жыл бұрын

Well explained with clear presentation I really like your videos, because after seeing that I haven't any doubts 👍

@CQEAcademy 3 жыл бұрын

Awesome, thanks for the feedback, I'm glad you like them!

@akanksharai1366 3 жыл бұрын

@@CQEAcademy also make a video on MSA

@CQEAcademy 3 жыл бұрын

@@akanksharai1366 will do! I'm sure i'll create a video on MSA here in the next 2 months or so. BTW - feel free just to call me Andy :)

@sierrafreeman2793 3 жыл бұрын

God bless ur soul now i wont fail my exams thank u so much

@CQEAcademy 3 жыл бұрын

hahahaha thanks!!!! I'm glad you love it!! -Andy

@hfulong Жыл бұрын

This is so easy to follow. Very helpful. Great work!

@CQEAcademy Жыл бұрын

Wow thanks so much, I appreciate that!!

@brudo5056 6 ай бұрын

OK, this is about starting the charts but is there also a video or explanation what and how to act when the process gets out of control... when and how to recalculate limits, eliminate outliers etc... Thanks for this intro anyway. Greetings.

@haroldchrist5174 3 жыл бұрын

thank you so much. this is really easy to follow.

@CQEAcademy 3 жыл бұрын

You're welcome!!! I'm glad you enjoyed it and found it easy to follow!

@minimonie9825 8 ай бұрын

Thank you sir, very easy to understand! Truly appreciate it :)

@akakarun8 3 жыл бұрын

Finally today I got to know about Rational Subgroup. Thanks from India.👍

@CQEAcademy 3 жыл бұрын

Awesome, glad I could help!!!!

@nikolaizaicev9297 4 ай бұрын

I wish these things were taught in business degree classes, that would save billions and many companies from closure. Worked one time at a company, where they have appointed a "manager" to be a process manager, who did not know anything about spc nor the variation nor the chart technique, that person did not even know how to draw a flow chart. Needless to say, his whole "procedure of management" went then into the direction of fire fighting and blaming of the workers including constant firings, etc. Hire and fire mentality in sales departments is another example of lack of knowledge and understanding in that field.

@rachidakeita4671 Жыл бұрын

you explain very well , thanks a lot

@CQEAcademy Жыл бұрын

You're welcome!

@bakihanma1680 9 ай бұрын

extremely helpful !

@paulspeelman5619 5 күн бұрын

I always viewed x bar & r charts as the x belongs to the operator (it’s what they can adjust), the r belongs to management (equipment, tooling, material, environment). Unfortunately to many managers want everything to fall to the operator, hence actual improvement is not possible.

@rushikeshsanap1014 2 жыл бұрын

Love you sir from India

@CQEAcademy 2 жыл бұрын

Thanks Rushikesh!!!!!!!!

@ThePrajendr 5 ай бұрын

Thanks for the video! What do you recommend when we have much larger subgroup sizes? And do you have any recommendations for how to create the centerline? I imagine it's a rolling statistic rather than something static?

@coolshian 4 ай бұрын

Same questions too 🙋

@lindokuhledladla991 10 ай бұрын

This is exactly what I needed

@SameeraPriyadarshana76 2 жыл бұрын

Well explanation ....!!!!!!!!

@CQEAcademy 2 жыл бұрын

Thanks Sameera!!

@plalelal 5 ай бұрын

Great video presentation and explaination!

@manizhehsaeedmehr5512 3 жыл бұрын

Thanks a lot. Very useful 👍👍👍

@CQEAcademy 3 жыл бұрын

You're welcome!

@feeelsx 5 ай бұрын

This is amazing 🤩

@noreltrabi1229 2 жыл бұрын

Thank you so much for this video !!

@CQEAcademy 2 жыл бұрын

You're welcome!!!!!!!

@Muhammadharis-ds3tr Жыл бұрын

May Allah bless u thanks alot

@CQEAcademy Жыл бұрын

You're welcome Muhammad!!!

@user-mv6ef5vo4i 6 ай бұрын

Dear Andy, I need to select a control chart to follow up our customer complaints(for CAPA triggers) , we produce single products (not batches) and there are many attributed customer complaints categories (such as: uncomfortable, broken, wrong parameters ,etc..). number of manufactured products and number of complaints varies each month. My best pick is P chart where I divide the total number of complaints received each month by the number of manufactured products from the previous month (if on January we produced 100 products and on Feb we received 10 complaints then my data point is 10/100=0.1), obviously the only control limit in my interest is the UCL. Do u think I picked the proper control chart? would like to hear your thoughts in general:)

@odalfrypolonia3099 7 ай бұрын

amazing video it was easy to follow. thank you.

@vijaybenz9741 5 ай бұрын

studying this topic for my engineering exams

@samuelorozco5984 2 жыл бұрын

Great explanation! I think it would be great if you could include some analysis for what the case would be if we include intermediate lines (+/-1 stds & +/-2 stds). Also, what would the conclusion be if we plot a R point outside the UCL, but the x bar plot is within the UCL and LCL. My understanding would be if the R is out of control, the X bar is inaccurate. But does that necessarily mean that x bar is out of control as well, or is it simply x bar in control and R is out of control? Thanks

@CQEAcademy 2 жыл бұрын

Hey Samuel!!! Great suggestion, that's definitely a good future video! okay, so it is possible for special cause variation to impact your R chart, but not your X-bar chart. That's why we have both charts, because it's important to monitor both the center of your process (X-bar) and the variation within your process. And either chart can alert you to special cause variation!

@Name-ur6oj Жыл бұрын

Hi! May I ask, where did you make your x-bar and r chart? Is there any particular application or website you recommend for me to use in making a control chart? Thank you!

@CQEAcademy Жыл бұрын

Hey There!! I made that control chart in Excel

@Name-ur6oj Жыл бұрын

@@CQEAcademy Oh I see, thank you!

@CQEAcademy Жыл бұрын

@@Name-ur6oj You're welcome

@editingandffqueen7907 3 ай бұрын

Your the best teacher ❤❤❤

@CQEAcademy Ай бұрын

Thanks so much!

@adrianaescuder5290 Жыл бұрын

hi! One question, if we calculate the icl and lcl by hand, how can we get the z (number of normal standard deviations)? Thanks :)

@andyrobertson566 Жыл бұрын

Hey Adriana! In your example, do your UCL and LCL change over time, or are they fixed after you perform the calculation?

@rellappanmech1111 2 жыл бұрын

Thank sir. students can easily understand

@CQEAcademy 2 жыл бұрын

Thanks, I'm glad you enjoyed it!!!

@zzxczxcc502 Жыл бұрын

Thank you .. sir . 💟

@CQEAcademy Жыл бұрын

You're welcome!!!

@amirjavadkar1632 3 ай бұрын

Excellent❤❤❤, One question What if we have different tolerance for each subgroup, For example for subgroup 1 we have +/-2 and for subgroup 2, +/-3 and so on, Have we calculate process capability in this condition?❤❤❤❤❤❤

@brentlackey8316 6 күн бұрын

How can you calculate the control limits with your formula? I thought the limits were given on the blue print.

@ravindrajoshi78 9 ай бұрын

Excellent!!..

@user-fh7zl6ud4m 6 ай бұрын

Thanks Again.

@westclark9439 3 жыл бұрын

Super helpful!!! One Question: can the Y values for the Xbar and R chart chart be negative?

@CQEAcademy 3 жыл бұрын

Hey West, Generally the answer is no, unless you're measuring some attribute that can also be zero. For example if you were monitoring the temperature of a cold process, you could realistically measure temperature values below zero. However, if you're simply measuring a small attribute that can never be a negative number, and your lower control limit is a negative number, the general practice is to move that up to zero. -Andy

@agradhanurwedhasakti4865 Жыл бұрын

Thanks for your videos, it really helps a lot. A quick question though, what if I measure each sample 2 times? Do I need to count each of them as 2 samples or as 1 sample but using their average measurement?

@CQEAcademy Жыл бұрын

Hey Agra, I assume that when you take those 2 measurements, that you're measuring the same characteristic - not two different things (dimensions, etc). I haven't run into that situation before - why would you measure the same sample twice?

@agradhanurwedhasakti4865 Жыл бұрын

@@CQEAcademy Yes, it is the same characteristics but 2 replications. I am not really sure why there are 2 replications because I just retrieved it from old data, probably because there is a doubt in the gage precision

@CQEAcademy Жыл бұрын

@@agradhanurwedhasakti4865 That's what came to mind when I first read the two replicate measurements, that someone was worried about gage precision. Honestly, what I'd do is run a Gauge R&R, and if the R&R is acceptable - go down to only a single measurement! That might be a huge form of waste (over-processes) by measuring the same sample twice. And if the gauge R&R is bad. . . it might be time to find a new gauge - too much precision should not be overcome by repeated measurements.

@gillianreyes2974 Жыл бұрын

Thank you this helped me a lot!

@thiagobianchini9972 6 ай бұрын

Is there a table with more than 100 sample size for A2 and D4? Or how can I calculate those?

@cashmetanzania6826 Жыл бұрын

Do we need the same number of sample size for all sub groups?

@CQEAcademy Жыл бұрын

Great question! I would recommend using a consistent sample size over time because it will make it easier to manage the control chart over time. Changing sample sizes is not impossible, but you have to make sure that as you change the sample size you don't violate the requirement of having a rational subgroup, and you will have to re-calculate your control limits with your different sample sizes.

@user-tv7lu5od2v 5 ай бұрын

wow! Thanks this is really helpful.

@peinomaher293 2 жыл бұрын

Thanks for your video Is there video longer than this

@CQEAcademy 2 жыл бұрын

You're welcome Peino! I do cover this topic in alot more detail in my course, The CQE Master Class

@peinomaher293 2 жыл бұрын

Thanks

@Blackshark553 7 ай бұрын

very Excellent

@rupeshchoudhari96 3 жыл бұрын

🔥lit explanation I was going through hard time of understanding this... Now I thought how easy it is...

@CQEAcademy 3 жыл бұрын

Awesome, thank you Rupesh!!! I'm glad I can help you grow!

@rupeshchoudhari96 3 жыл бұрын

@@CQEAcademy Ya, it helped me in my diploma exam... 😅 Last minute studies!

@CQEAcademy 3 жыл бұрын

@@rupeshchoudhari96 fantastic, what are you getting your degree in?

@rupeshchoudhari96 3 жыл бұрын

@@CQEAcademy I'm currently in last year Diploma (Mechanical)

@CQEAcademy 3 жыл бұрын

@@rupeshchoudhari96 Best of luck!!!! I got my degree in mechanical. Let me know if there are any other topics that you'd like to see. -Andy

@greteldsouza3979 Жыл бұрын

thank you

@CQEAcademy Жыл бұрын

You're welcome Gretel, and thanks for the comment!

@people_chronicles 3 ай бұрын

Time stamp - 9:30 Do we not do a "X bar S chart" for this one since our subgroup size is more than 8?

@jarodjenkins Жыл бұрын

Great information. This is the youtube channel i've been looking for! fucking amazing

@CQEAcademy Жыл бұрын

Wow thanks so much Jarod!!!!

@19manu06 3 жыл бұрын

You are a genius. Make more videos, Awesome!!!!!!!!!!

@CQEAcademy 3 жыл бұрын

Thanks! I'm glad you like it!

@sachinbr7262 8 ай бұрын

is the time period between each sub groups a standard. For example if the time period between each sub groups are 24 hours then what is the use of using control charts because if the time period is too long we cannot estimate fast how our process is under control. Please answer sir

@cocopop111 3 жыл бұрын

Question: at which point do you conclude that a process is out of control ?..... how many data points out of 2 or 3 sigma. Is there a standard that shows which qualifies of a process not in Control and needs action?

@CQEAcademy 3 жыл бұрын

Great Question!!!! Okay, so I hinted at this in the video, but there are other ways (besides being outside the 3-sigma control limits) where the data indicates that the process might be out of control. There are other rules - the most popular being the Western Electric Rules (en.wikipedia.org/wiki/Western_Electric_rules) that you can use to also detect patterns in your data that indicate that your process is out of control. Also, I should say, that it is completely possible that your process have a single data point outside of the control limit, and the process is still only experiencing normal process variation (there's a 0.3% chance that this could happen). So when you get a point that's "out of control", you should start the investigation to determine that special cause of the variation.

@cocopop111 3 жыл бұрын

Ok great thanks ....

@CQEAcademy 3 жыл бұрын

@@cocopop111 You're welcome!