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I'm trying to make linear models in R, using the practicing datasets (sim1, sim2, sim3, sim4). So I used this code,

mod1 <- lm(y ~ x1 + x2, data = sim3)
mod1

And it printed this one.

Coefficients:
(Intercept)           x1          x21          x22  
     1.8717      -0.1967       2.8878       4.8057  
        x23  
     2.3596

But I have no idea what x21, x22, x23 means. Can anyone tell me about it?

alejandroll10
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user401378
  • 11
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    Well, your x2 variable is a character-valued covariate with four levels. For each level after the third, you get a coefficient. The coefficients are estimates of the formula of your model. – Michael M Nov 26 '23 at 12:09

0 Answers0