2k views

### Interaction Suppresses Main Effects in Repeated Measures GLM? [duplicate]

Possible Duplicate: What if interaction wipes out my direct effects in regression? I have three hypotheses within my experiment, and interpreting the interaction in relation to the rest of the ...
1k views

### Excluding the components and only including the interaction term in a logistic regression? [duplicate]

Possible Duplicate: What if interaction wipes out my direct effects in regression? We have a question regarding a regression we are working on. We have two dummy variables, net income (If net ...
59 views

### ANOVA - Adding interaction term changes a main effect to being insignificant. How can that be? [duplicate]

UPDATE: I don't think the single posted answer is correct. When I run summary(lm(DependentVar ~ IndVar1 * IndVar2, data = Data1)) the first listing is IndVar11 @ p = 0.113, and the four IndVar1:...
183 views

### How to interpret an insignificant main effect that became significant at the presence of interaction effects in moderated regression analysis? [duplicate]

Possible Duplicate: What if interaction wipes out my direct effects in regression? I did hierarchical regression analysis on my data due to having interaction effects in my research model. All ...
60k views

### Does it make sense to add a quadratic term but not the linear term to a model?

I have a (mixed) model in which one of my predictors should a priori only be quadratically related to the predictor (due to the experimental manipulation). Hence, I would like to add only the ...
42k views

### Why could centering independent variables change the main effects with moderation?

I have a question related to multiple regression and interaction, inspired by this CV thread: Interaction term using centered variables hierarchical regression analysis? What variables should we ...
5k views

### Removing factors from a 3-way ANOVA table

In a recent paper, I fitted a three-way fixed effects models. Since one of the factors wasn't significant (p > 0.1), I removed it and refitted the model with two fixed effects and an interaction. I'...
4k views

### Interaction suppresses the main effect? How to interpret it?

I have a simple model without interaction and it stated significant effect for all the explanatory variables (continuous variable rok and categorical variables obdobi (levels hn and nehn) and kraj: <...
3k views

### Interpreting the changing significance of a variable in a Logistic Regression

I am testing the relationship between two variables (Similarity index; Years patenting) on a binomial dependent variable via a Logistic regression in SPSS. I tried two models as you can see bellow in ...
2k views

### Estimating Multilevel Logistic Regression Models

The following multilevel logistic model with one explanatory variable at level 1 (individual level) and one explanatory variable at level 2 (group level) : \text{logit}(p_{ij})=\pi_{0j}+\pi_{1j}x_{...
2k views

### Is it meaningful to identify interaction effect when a main effect in a model (main effects only, without interaction terms) is not significant?

Let's say there's one DV (Y) and three IVs (X1, X2, X3), ...
5k views

### How to interpret the significant interaction of two non-significant main predictors?

I have two non-significant main binary variables in my binary logistic regression model, but their interaction is significant. The variables are centered and no multicollinearity is the case (all VIFs ...
3k views

### Logistic regression: my main effects lose significance when I add my interaction effects. Why?

I have a dichotomous dependent variable for a 2x3 experiment. There are about 30 observations in each cell, for a total sample size of about 180. Each person was only in one cell. The dependent ...