categorical covariate

  1. W

    How to analyze a categorical confounding variable for experimental results

    I ran an experiment. The experiment had 3 conditions (C1,C2,C3). I analyzed the results which are countably infinite variables (e.g. - number of points) or a finite set of numbers (e.g. - on a scale of 1-5 how much did you like this?). I have two questions in regards to this data and possible...
  2. A

    How to interpret the intercept in a regression model which has a categorical covariate?

    I have a regression model with some response Y and covariates height, weight, age, sex. Sex is the only categorical covariate and it takes on the value Sex = 0, for female Sex = 1, for male I want to interpret the intercept of this model, that is the estimated mean value of Y when all the...
  3. K

    Categorical Variable Coding Question

    Hi! I have a question on the coding/use of categorical variables: In short, I have two control variables in an SPSS regression model. One is participant (15 levels, or participants) and one other categorical variable (10 levels). And there is just one predictor variable in the model. I've tried...
  4. E

    How to measure- effect of additional categorical DV on repeated m. ANOVA?

    Hello, I am helping a colleague analyze data from a user study. I am a little unclear how to deal with one of her measures. I would greatly appreciate any help! Description: Independent variable: -interface modality: -audio (A), visual (V), haptic (H), control (C- no interface) Main...