Regression Analysis Flashcards
Regression analysis is …
Analyses the dependence between the 1+ metric independent and 1 metric dependent variable
Moderation is …
The direction and strength of the relation between the indep. and dep.
Interaction effect is …
Moderator variable effect on the relation between two variables
Assumptions
Linear relationship (P-P plot), constant variance of the error term, uncorrelated, independent (cannot be assessed), normality (histogram, P-P plot) error term, imperfect multicollinearity (if indep. are uncorrelated)
How can linear relationship between the indep. and dep. be checked
Scatter plots
Residuals are …
Difference between the observed and the predicted values
OLS is …
Ordinary Least Squares estimates - when all assumptions are met, the estimates are unbiased and efficient
R^2 is …
The coefficient of determination, ranges from 0 to 1, means how much variance in the dep. can be explained by indep.
Validation can be done by using …
Cross-validation
The t-test is used for …
Whether the independent variable has a statistically significant effect on the dependent (similar to ANOVA, but 1 binary indep.)
