main effects

  1. T

    How is conditional main effect interpreted when there is interaction?

    I have a question about multiple regression. May I kindly ask how should I interpret the conditional main effect when the interaction is 0 and the coefficients have opposite signs, more specifically if one of the interaction term contains zero such as angle or time. Please see an example...
  2. P

    Logistic Regression Models Without Main Effects?

    Hi there, I am building logistic regression models measuring human behaviour, which consist of categorical variables: demographics, conditions, and interactions between the demographics and the condition variable. The big issue is that as per my theory tested I am not interested at all in the...
  3. T

    Accounting for other variables when looking for main effects (regression)

    I am doing a negative binomial regression, to look for interactions between categorical and continuous predictors. I am currently reporting main effects for both predictors, but am wondering whether I should account for the other predictor when doing so. So, if lang2 & BDCSBI are the...
  4. V

    Which Analysis is Correct? (if any)

    Hi! I have a design with two categorical iv and one continuous iv with a continuous dv. I wanted to see if there was a main effect or interaction from the categorical ivs, so I used the syntax: glm DV by IV1 IV2. There were no significant interactions or main effects. I wanted to then add...
  5. C

    One-Way repeated Measures ANOVA: how to follow up main effects?

    Hi all, I run a One Way Repeated Measures ANOVA to compare color differences means on SPSS. I have a within-subjects factor with 7 levels and a between-subjects factor with 9 levels. I did a GLM > repeated measures on SPSS and got only main effects, no interactions. How should I proceed...
  6. R

    Formerly non-significant main effect becomes significant after interaction is entered

    Hi there, I'm running a hierarchical regression with 3 IVs. First step: main effects, second step: two-ways, third step: three-ways. In the first two steps, one of the IVs was non-significant. Once the three-way interaction was entered in the third step (which was non-significant), the IV...