(We restrict HRH interactions to the time trend main effect and omit interactions with the time trend squared term; our specification is based on our findings that no HRH density-time trend squared term interactions are significant either individually or jointly) This is motivated by our previous observation of the financial crisis and policy changes that took place during our study period.
We also omitted interaction terms.
Therefore, we omitted interaction terms to simplify the final model.
However, lack of fit can arise from a fundamental mistake or omitted interaction in the reaction description.
This may be related to nonlinear effects of the continuous variable age, or to omitted interaction terms.
Because we were only interested in PPI, we omitted interactions involving non-protein molecules provided by BIND.
We will test interactions for entry into the model, and omit the interactions if they are not significant.
The third step is to revise the model to omit factors, interactions and covariates that do not contribute systematically to the value of the dependent variable.
Similarly, a logistic regression revealed that an interaction term for experiment X condition was a significant predictor of people's crime-fighting suggestions: a model that included the three predictors (experiment, condition, and the interaction term) was significantly better than a model with two predictors (omitting the interaction term), χ2 (1, 459) = 5.85, p<.05.
To create the null distribution of test statistics corresponding to the interaction term (β G × E ), we fit a logistic regression model omitting the interaction term (β G × E = 0), while leaving parameters that modeled the main effects of the environmental factor, SNP, and age, sex, race, and BMI.
Cleary this finding omits the interaction between consolidation episodes and growth and the implication that a fiscal adjustment has on growth, which in turn can make consolidation episodes more likely associated with recessions than economic expansions.
