Calculate Simpson's Index

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8 жыл бұрын

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This is a brief tutorial to explain a bit about Biodiversity and how to use "Simpson's Index of Diversity" to compare the diversity of different sample areas.
I suggest pushing pause when each sample comes up and trying it yourself. Hopefully the practice helps.
If you are an IB Biology student, 'they' suggest using Simpson's Reciprocal Index, which is a little different than my demo which uses "Simpson's Index of Diversity". Check out this link if you want to see the what the difference is... www.countrysideinfo.co.uk/simp...
Basically, the reciprocal index will give you a number that you compare to the number of different species you have. The closer your value to the species number = higher diversity.
I don't like this because it makes it harder (extra steps needed) to compare different samples. Therefore I like the "Simpson's Index of Diversity" because you are always left with a value between 0 (low) and 1 (high diversity). To be more precise, you are left a probability that, if you select two individuals out of your sample at random, your number would reveal the chance (%) of picking two different species.
Let me know if you have any questions.

Пікірлер: 88

@judizollweg1385 2 жыл бұрын

This was the BEST explanation of Simpson's I have found. I teach Environmental Science elective to high schoolers and Biodiversity is a chapter I cover. I have been working on this awhile and never understood it until now. THANK YOU!!!!!

@tristengleason9605 4 жыл бұрын

Thank you! I’ve come back to this video many times for my biology classes.

@savannahrose8631 5 жыл бұрын

Thank you, helping me study for my Ecology exam! I needed more detail on getting from point A to point B and you've helped!

@Basilogonzalis 7 жыл бұрын

Thanks Bro!! That was an amazing video with really proper illustrations.

@PeterStanley 7 жыл бұрын

No worries, I'm glad it helped.

@menzizacks6345 11 ай бұрын

Simpson's index, break made simple, I have been stressed out on how to approach this thing, thanks for breaking it down you have made my day

@picksbypat 5 жыл бұрын

Thanks, excellent example, and helped me understand this formula. Will find it very useful in my book.

@warcraftdevil4593 5 жыл бұрын

Thanks really needed this. I couldn’t understand my teacher when she explains it

@anjipoplindermann5484 6 жыл бұрын

Thank you soooo much; you've explained this incredibly well. I find all aspects of scientific maths difficult...….but you made this look easy THANKS :D

@genanewagitew6287 2 жыл бұрын

I found it important for my study. Thank you so much! I will also be extremely happy if I could the original article of the Simpson.

@jye-linhsu1105 4 жыл бұрын

Really great. Thank you so much. It's so useful.

@uaehoverfly 6 жыл бұрын

Thank you so much, this was very clear and easy.

@isaacperez1337 5 жыл бұрын

Great video! Thanks for that easy explanation. Can you explain Biological value index (sanders,1960), please that would be great

@annagergely9551 7 жыл бұрын

Thank you so much! I have my ap bio exam tomorrow and this helped so much. The video was clear and easy to understand

@PeterStanley 6 жыл бұрын

Glad to hear it helped and hope you did well on that bio exam.

@gracemercy2058 5 жыл бұрын

That was very helpful.Thanks Peter

@Ali-ks5kz 4 жыл бұрын

thanks for useful information but I have a question how can we calculate the whole diversity of all these three indexes?

@nisanahmed2262 5 жыл бұрын

Thanks bro..It was really very useful

@rishabkumarmodi5959 6 жыл бұрын

Please make a video on how to count animal species withing a sampling area.. And on what basics can i select sampling area..

@deepsoldierx2633 2 жыл бұрын

Thank you very clear and straight forward.

@rizkynazarreta2077 7 жыл бұрын

thank you so much :) its very helpfull and I get the high diversity in my result data.. yeeayyyy

@DGB149 6 жыл бұрын

Excellent explanation! Well done

@PeterStanley 6 жыл бұрын

Thank you.

@thomasbryrup6526 7 жыл бұрын

Awesome video! It really helped me a lot. Wish you would do other measures of alpha diversity as well :) All the best.

@PeterStanley 6 жыл бұрын

Cheers, I'll give some more tutorials a try and share soon.

@pauloliver3721 7 жыл бұрын

Thank you, you are about to help me nail my 2nd year Palaeontology exam!!!! sooo helpful and easy to follow

@PeterStanley 7 жыл бұрын

Hope you crushed it!

@pauloliver3721 7 жыл бұрын

Peter Stanley it didnt come up and not much else did in regards to my revision but did ok anyway I'm sure thanks dude

@PeterStanley 6 жыл бұрын

At least now you're prepared for the random day when a bit of statistics jumps back into your life ;)

@gugulethulorrainesibanda7766 5 жыл бұрын

Crystal clear thank you

@capucinerambaud521 Ай бұрын

thanks for your videos, they are really hepfull

@vagishdev 3 жыл бұрын

Thank you Sir, it was really helpful

@biplabghosh1552 4 жыл бұрын

Awesome sir, thanks

@andreawaters7089 5 жыл бұрын

Thank you! Been struggling as I've been shown a different formula and I'm a mature student so, sort of on my own.

@KeenKoala115 4 жыл бұрын

Andrea Waters Your only on your own if you think you are. Keep at it 💪

@isadorabordini9528 3 жыл бұрын

Great video! Thank you!

@sonamtshering6787 Жыл бұрын

Thank you so much. I found it useful

@TGuyHD 5 жыл бұрын

That was very helpful big thanks from Morocco

@PeterStanley 5 жыл бұрын

Shukran. Good to know it's helpful.

@2000luisfelipe 6 жыл бұрын

Really great video!

@PeterStanley 6 жыл бұрын

Thank you

@captainmelon1447 3 жыл бұрын

This was really helpful!! Thank so you much!

@PeterStanley 3 жыл бұрын

Glad it was helpful!

@aashutoshjaiswal2290 2 жыл бұрын

Sir ji..salute ♥️

@missbubby007 7 жыл бұрын

amazing!

@amitsahu176 5 жыл бұрын

nice bro thaks a lot it was very difficult for me to understand thanks bro

@shentaluigi4191 6 жыл бұрын

this is help me a lot, thank you so much

@PeterStanley 6 жыл бұрын

Great to know it helped.

@dominickamune6718 5 жыл бұрын

Thanks...im now understanding

@alexandermishvelia4136 8 жыл бұрын

So helpfull !! - Thank you!

@PeterStanley 7 жыл бұрын

Great to hear this helped.

@yushanbai2800 3 жыл бұрын

Thank you so much! What's the tool you used to make the slides? The emoji getting dropped on the screen was great!

@PeterStanley 3 жыл бұрын

Glad you like it. I use Keynote (slideshow application from Apple).

@ciciliyakiran9832 6 жыл бұрын

Thank you.

@cuteegirl114 3 жыл бұрын

What is difference between shannon diversity and simpson diversity index? Why we calculate both when we have to measure diversity.. Plz answer

@emilyrose_tbdc 7 жыл бұрын

Thank you this helped me a lot

@mlawgetachew9922 6 жыл бұрын

ya you are right sister

@capucinerambaud521 Ай бұрын

I have a question, if I want to know the global diversity of my total area, do i I average my Simpson indices from every quadrats ? ex: if i find D=0.62 for my first quadrats and D=0.41 for my second, i can just do the average to know my simpsons indice ?

@anthonyburgers1317 2 жыл бұрын

Why is the -1 in the equation a fail safe?

@thewayoftea Жыл бұрын

What if you have a relatively large number of species where you only have one individual in the sample? You end up cancelling these species by subtracting 1 because the value is zero. Please explain. Thanks!

@sakuraremell5377 Жыл бұрын

legend! thank you so much

@CaptPeanutBut 3 жыл бұрын

Thank you!

@mariedankworth3795 4 жыл бұрын

Super helpful :)

@drchioma1962 3 жыл бұрын

Thanks so much. It really helped.

@drchioma1962 3 жыл бұрын

Do you have any reference for the formula applied please, I am writing up a manuscript?

@PeterStanley 3 жыл бұрын

Here is a good summary: www.countrysideinfo.co.uk/simpsons.htm

@zoraizzia958 6 жыл бұрын

The real MVP

@kipropanthony1956 4 жыл бұрын

Thanks a lot.

@CaptainObvious55 Жыл бұрын

tx a lot, exam in 2 days

@garethedwardking5860 3 жыл бұрын

I wouldn't take on such a huge range of taxa; no higher than family level rather than including so many quite unrelated Classes and Orders. What kind of conclusion can be reached even if comparing two very similar habitats?

@PeterStanley 3 жыл бұрын

In my ecology units (in biology and environmental science) questions tends to be 'how does human impact (noise, trash, traffic, water pollution, etc) affect the diversity of 'x' as you move down a line transect'. We've used pitfalls, tree shakes, etc and our results in Udzungwa and Jozani national parks in Tanzania and have found some interesting correlations. Granted this is for a one-week study so we rarely conclude on the cause if there is a change in diversity along a transect. Feedback is always welcome and I hope you can share your specific suggestions that my students could pursue. Feel free to get in touch.

@garethedwardking5860 3 жыл бұрын

@@PeterStanley Thanks Peter. It's probably because I'm an old school taxonomist and the students either mess up in terms of classification per se anyway or I'm always emphasising their necessity of being highly observant as trainee biologists. I've never looked at more than one taxon in a transect for example, so would get the students to concentrate on learning to differentiate different species of low plants along a line transect and then look at their relative abundance in relation to each other. Perhaps the detail is that which I wouldn't want them to lose. I can't imagine doing field work in an East African park; here I am temporarily in Poland and insect diversity at the end of April is poor. Birds are the feature taxon.

@shriyayerramsetty7046 10 ай бұрын

you look like your beekeeping age. Also THANKS I NEEDED THIS.

@blumendaisy 2 ай бұрын

THE WAY MY JAW DROPPED BUT REALLL😭

@jaydave2500 5 жыл бұрын

What if n=1 and N=1 ...the formula doesn''t work.

@PeterStanley 4 жыл бұрын

Good point. The idea of having 1 of any species in this formula would result in '0'... suggesting that it shouldn't really be counted because it's a probably an anomaly or random error in your data collecting. It's a pretty clever actually.

@thewayoftea Жыл бұрын

@@PeterStanley I have benthic invertebrate data with a number of species present as a single individual per sample in each site, but they are not being counted, which doesn't seem accurate to me.

@reyna7100 8 жыл бұрын

I still don't get it :(

@PeterStanley 8 жыл бұрын

+Queen Hi Queen, let me know what you are stuck with and maybe I can help.

@reyna7100 8 жыл бұрын

+Peter Stanley Okay um firstly in UK textbooks the equation is like D=1-Σ(n/n)² so I'm confused how to change it. also everything between 3:40 to like 4:20, why must you decrease everything by 1? hope you can help, Thank you :)

@PeterStanley 7 жыл бұрын

Took me a while to see this comment but I hope you found the link in the description that shares more about the index. It's pretty useful for your question.

@eclipseofodile6191 Жыл бұрын

theres a mistake, you cant have same probability for the different habitat

@eccentricone8886 3 жыл бұрын

Anyone ever told you that you sound a lot like Joaquin Phoenix?

@PeterStanley 3 жыл бұрын

That's a first

@BiologyTerms 6 жыл бұрын

Bigger the value lower the biodiversity......

@PeterStanley 4 жыл бұрын

Just checking that you did the last bit... D = 1-..... I've forgotten this step many times and then my results are backwards.

@magikcode 8 жыл бұрын

I clicked away when you chose the upper right equation

@PeterStanley 7 жыл бұрын

The IB doesn't mind you using the upper right version but sorry to hear you didn't give it a go. It really is much easier to make sense of than the other version.