Robin Stewart Samuel Kramer

3 Questions 2 Answers 0 Followers

Questions related from Robin Stewart Samuel Kramer

How do you calculate the sample size for a binomial logistic regression when the predictor has three groups?

When I have a binary outcome variable and a binary predictor, I am able to calculate the sample size needed using either G*Power (under z tests -- logistic regression) or R (wp.logistic). However,...

28 June 2021 9,791 3 View

How do you deal with multicollinearity in multilevel models?

If you have two or more correlated predictors in a multiple regression, it's possible to run a PCA on them in order to 'boil them down' to fewer predictors that no longer suffer from the issues...

11 March 2020 2,708 3 View

Comparing different Likert scales and the underlying (latent) variable they measure

Imagine we have ten pictures of faces and we have them rated for attractiveness. Let's say 20 participants rate them using a 1-5 Likert scale (1=unattractive; 5=attractive). Another 20...

01 January 1970 1,974 3 View