I have a response column and a column of categorical predictors (around 25 categories) and I get with
minitab linear regression analysis a R-sqr adjusted of 75%.
For simple linear regression analysis the R-sqr is equal to the coefficient of determination, is this also true for multiple linear regression analysis? Can I conclude that the two columns have a coefficient of determination of 75% which gives a correlation of around 0.9?
(Most of the predictors / terms have a p-value of >0.05, so the created linear model is not useful.)