Basics: Standardization and the Z score

Many students have a difficult time understanding standardization when starting out in learning statistics. Common questions often include:

  • What does standardized mean?
  • How do you standardize a score?
  • Why should I give a damn?

The answers are fairly straightforward. Here’s a rundown for your statistical woes.

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Intro Topics: A Regression Primer

Welcome to another stupidly-long, but hopefully informative instructional on introductory statistical concepts. Today we tackle regression analysis.  Use the menu links below to jump around if you need/want to get a quick bit of info on any topic:


1) Background: Correlation analysis [conceptually] explained
2) Correlation analysis and OLS linear regression
3) From guesses to predictions: The logic of using linear regression
— a) Building the equation
— b) Interpreting regression
— c) What is OLS?
4) Advanced Applications
5) Conclusion & Further reading

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Basics: Highway to the Danger Zone: Why median-splitting your continuous data can ruin your results.

Not too long ago, I wrote an article here about advanced procedures for examining interactions in multiple regression. As I described some of the challenges researchers commonly face in trying to examine differences between people in a data set, I argued that when it comes to data analysis, splitting a continuous variable into a dichotomy (i.e. two categories) is kind of a dumb idea (MacCallum et al, 2002). Continue reading