1. Why search() function is used?

Answer: search() function helps to see that which packages are currently loaded.

2. On which type of data binary operators are worked?

Answer: Binary operators are worked on matrices, vectors and scalars.

3. What is the use of doBY package?

Answer: It is used to define the desired table using function and model formula.

4. Which function is used to create frequency table?

Answer: Frequency table is created by table() function.

5. Define loglm() function.

Answer: Loglm() function is used to create log-linear models.

6. What is the use of corrgram() function?

Answer: corrgram() function is used to plot correlograms.

7. How to create scatterplot matrices?

Answer: Pair() or splom() function is used for create scatterplot matrices.

8. What is the use of diagnostic plots?

Answer: It is used to check the normality, heteroscedasticity and influential observations.

9. Define anova() function.

Answer: anova() is used to compare the nested models.

10. What is cv.lm() function?

Answer: It is defined under the DAAG package which is used for k-fold validation.