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latest blog posts

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

Member Training: Coarsened Exact Matching, an Alternative to Propensity Score Matching

February 29, 2024 • TAF Support

The objective for quasi-experimental designs is to establish cause and effect relationships between the dependent and independent variables. However, they have one big challenge in achieving this objective: lack of an established control group. Read More

stat skill-building compass

Find clarity on your statistics journey. Try the new tool Stat Skill-Building Compass: Find Your Starting Point!