Recent content by martink

  1. M

    Effect of adding covariates to regression model

    And I think there is a loss of power i.e. when you dichotomize a continuous variable, there is definitely a loss of power, so I assume when you make further categories within the variable, there's a further loss of power. Also a good point above about multiple comparisons.
  2. M

    Effect of adding covariates to regression model

    What is the impact of adding a larger number of covariates to a multivariable regression model? I think I read it has some impact on power, or precision or some other effect? Also, if one of the variables in the model is categorical, like income, classifying people into four income quartiles...