Nonparametric test Mann Whitney U

If you have a numeric variable like salary that you would like to compare with a test between 2 groups say male and females, you might think of using t-test. But there are rules for every [...]

Statistics – report p-values in correlation or not?

My teacher in statistics told us following: “don’t report the p-values from the correlations, stay with the correlation coefficient only”. First I didn’t understand what [...]

Statistics – Normality test

Hi, I got a comment from a SPSS developer person that has a LOT of knowledge. He mentioned after my blog post in August about normality, that it’s also possible to make a test of the [...]

Statistics – understand independent t-test

In this example I will make a t-test to test if males and females mean values of salary differs significantly from each other. To do a t-test the salary should be normal distributed for male resp [...]

Statistics – how to test in Custom Tables?

I got a question from a user: How do I use the testings within the Custom Tables command? Which test should I use? (Custom Tables is an add on module, for user that makes a lot of [...]

Statistics – proportions test or p-test or z-test

When you find that a chi-Square test made on a  crosstable has a significant result like this: You then know that there are differences between the distributions in the cross table, in my example [...]

Statistics – one sample chi-square test

Hi, many times (specially during my Statistical trainings), user ask me why they could find 2 different commands for chi-Square test (or chi2-test). The reason is that there is one chi-Square [...]

Statistics – Exact Test on small or skewed data

Hi, sometimes it happens that you have too small or too skewed data to be allowed doing traditional statistical tests. For example chi2-test has some rules that has to be fulfilled (I will show [...]

Statistics – nonparametric pairwise test

Last Monday 13/8 I studied a difference between “stress after” and “stress before”, to see if this difference was normal or skewed distributed. The mean value of the [...]

Statistics – Multiple Linear regression

Hi, here is one long blog post for this week, because of a question I got. The user has tried to find any “step-by-step” instruction how to do multiple linear regression, but [...]

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