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latest blog posts

Member Training: Linear Regression in SPSS (Tutorial)

March 29, 2024 • Kat Caldwell

Regression is one of the most common analyses in statistics. Most of us learn it in grad school, and we learned it in a specific software. Maybe SPSS, maybe another software package. The thing is, depending on your training and when you did it, there is SO MUCH to know about doing a regression analysis […] Read More

Too Many Colors Spoil the Graph

March 26, 2024 • guest contributer

When you draw a graph- either a bar chart, a scatter plot, or even a pie chart, you have the choice of a broad range of colors that you can use. R, for example, has 657 different colors from aliceblue to yellowgreen. SAS has 13 shades of orange, 33 shades of blue, and 47 shades […] Read More

Assumptions of Linear Models are about Errors, not the Response Variable

March 19, 2024 • Karen Grace-Martin

I recently received a great question in a comment about whether the assumptions of normality, constant variance, and independence in linear models are about the residuals or the response variable. The asker had a situation where Y, the response, was not normally distributed, but the residuals were. Read More

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