### 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 – training in SPSS and methods

I talked to a SPSS user that was really frustrated, because she searched for method to her study and had googled around and found so much statistical information on the web and movies with SPSS [...]

### The forgotten statistics – Explore

I have a feeling sometimes that many user miss the informative command: Analyze – Descriptive statistics – Explore. This command, I have put some focus on during my statistical [...]

### 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 – 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 [...]

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