SPSS: Skew and Kurtosis (Non-Normal Distributions)

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SPSS: Skew and Kurtosis (Non-Normal Distributions) - 3 different ways

Рет қаралды 22,029

Virginia Wickline

Күн бұрын

Пікірлер: 19

@superpiggy001 10 ай бұрын

Thank you so much for the informative video!!! Truly appreciated it 😍😍

@virginiawickline2609 10 ай бұрын

My pleasure - glad it helped!

@bethzirkle4943 Ай бұрын

Very helpful!

@doardia6150 Жыл бұрын

Thank you! very helpful

@virginiawickline2609 Жыл бұрын

My pleasure!

@nikenpaudel2726 5 ай бұрын

Very informative video! I got a data (sample size more than 100) where the z value of skewness and kurtosis fits into the range of +3 and -3, which suggest the data is normal. But the kolmogorov smirnov test suggests the test is non normal. What inference or conclusion can be drawn from this? is the data normal or non normal?

@juanjo_sound 2 жыл бұрын

super helpful

@virginiawickline2609 2 жыл бұрын

Glad to hear - thanks! :)

@kirtideswal3921 Жыл бұрын

Thanku very much mam.. I have a question that how we interpreted it in our article. Can you suggest me any Article in which transformed data is shown

@virginiawickline2609 Жыл бұрын

I apologize for missing your comment. I do not have an article on hand to suggest. Sorry!

@kirtideswal3921 Жыл бұрын

@@virginiawickline2609 ok.. Thanku very much mam for your reply

@greyngreyer5 Жыл бұрын

So what about ordinal data? Scale responses, agree-disagree? How do I make an "appropriate" graph for those? Do I just mark those as scale-type data? You confused me xD

@virginiawickline2609 Жыл бұрын

From my understanding, statisticians disagree here. Some say it is OK to use a histogram for ordinal data (see, for example, sphweb.bumc.bu.edu/otlt/mph-modules/bs/bs704_summarizingdata/bs704_summarizingdata4.html#:~:text=When%20one%20is%20dealing%20with,categories%20have%20an%20inherent%20order). Others say you should not use a histogram for ordinal data and should use a bar chart or box-and-whisker plot instead (www.uni-bamberg.de/fileadmin/eng-ling/fs/Chapter_19/411Frequencydata.html).

@greyngreyer5 Жыл бұрын

@@virginiawickline2609 You rock! Thanks a lot. Appreciate the sources too :)

@phd.eriolamariuscharlotade5634 2 жыл бұрын

ı have tried all the transformation but still, it did not fixed the positive skew matter. what should we do?? please guide me

@virginiawickline2609 2 жыл бұрын

Hmm...have you also considered removing outliers (high Cook's D value) or cases with high leverage?

@phd.eriolamariuscharlotade5634 2 жыл бұрын

@@virginiawickline2609 is it normal to remove it. I am about to consider this variable as dependent one. It was behaving like poisson but with this behavior it doesn't respect poisson assumption either.

@virginiawickline2609 2 жыл бұрын

@@phd.eriolamariuscharlotade5634 Hi! You are reaching the limits of my knowledge. However, it is fairly common to remove cases with high Cook's D values so you are removing the influence of outliers. See, for example: towardsdatascience.com/identifying-outliers-in-linear-regression-cooks-distance-9e212e9136a