This has bugged me for some time now. There is a “common knowledge” that the correlation size is dependent on the variability, i.e. higher the variability – higher the correlation. However, when you put this into practice, there seems to be a confusion on what this really means. To analyse ...

Cronbach’s alpha reliability coefficient is one of the most widely used indicators of the scale reliability. It is used often without concern for the data (this will be a different text) because it is simple to calculate and it requires only one implementation of a single scale. The aim ...

Some find it a common knowledge, some find it weird. As a professor I usually teach about Monty Hall problem and year after year I see puzzling looks from students regarding the solution. Image taken from http://media.graytvinc.com/images/690*388/mon+tyhall.jpg The original and most simple scenario ...

Bubble charts are a great way to represent the data when you have instances that vary greatly, eg. the size of Canada compared to the size of Austria. However this type of a chart introduces a new dimension in the interpretation of data because the data is interpreted by the ...