Running regressions with categorical variables allows you to essentially calculate group means using the resulting intercept and coefficients (and it's a common replacement for ANOVA analysis). For instance, in this example predicting age by marital status, the intercept shows the mean age for unmarried people, while the intercept + the married coefficient shows the mean age for married people:Running regressions with categorical variables
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如何通过编程向R的截距项添加模型系数?
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