1. Define leaps().
Answer: It is used to perform the all-subsets regression and it is defined under the leaps package.
2. Define relaimpo package.
Answer: It is used to measure the relative importance of each of the predictor in the model.
3. Why car package is used?
Answer: It provide a variety of regression including scatter plots, variable plots and it also enhanced diagnostic.
4. Define robust package.
Answer: It provides a library of robust methods including regression.
5. What is robustbase?
Answer: It is a package which provides basic robust statistics including model selection methods.
6. Define plotmeans().
Answer: It is define under gplots package which includes confidence intervals and it produces mean plot for single factors.
7. What is the full form of MANOVA?
Answer: MANOVA stands for multivariate analysis of variance.
8. What is the use of MANOVA?
Answer: By using MANOVA we can test more than one dependent variable simultaneously.
9. Define mshapiro.test( ).
Answer: It is a function which defines in mvnormtest package. It produces the Shapiro-wilk test for multivariate normality.
Answer: Barlett.test() is used to provide a parametric k-sample test of the equality of variances.