PHP Interview Questions - 25 | Snaprecruit.com

PHP Interview Questions - 25 | Snaprecruit.com

PHP interview questions part 25

PHP interview questions part 25

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Total Questions: 20

1. Which of the following object is masked from ‘package: stats’?

Correct Answer is : true0

2. The _________ function can be used to select columns of a data frame that you want to focus on.

Correct Answer is : No 2

3. ________ function is similar to the existing subset() function in R but is quite a bit faster.

Correct Answer is : 5

4. Columns can be arranged in descending order too by using the special ____ operator.

Correct Answer is : 869

5. The _________ function is used to generate summary statistics from the data frame within strata defined by a variable.

Correct Answer is : 59

6. The ______ operator allows you to string operations in a left-to-right fashion.

Correct Answer is : 2

7. There is an SQL interface for relational databases via the _______ package.

Correct Answer is : 16

8. dplyr can be integrated with the ________ package for large fast tables.

Correct Answer is : 1

9. .Which of the following function is similar to summarize ?

Correct Answer is : 24

10. ______ let’s you perform SQL queries on your R data frames.

Correct Answer is : error

11. ______ splits a data frame and results an array (hence the da). Hopefully you’re getting the idea here.

Correct Answer is : error

12. ________ makes it incredibly easy to fit time series models like ARIMA, ARMA, AR, Exponential Smoothing, etc.

Correct Answer is : 5

13. ________ provides needed string operators in R.

Correct Answer is : 6

14. Which of the following syntax is used to install forecast package ?

Correct Answer is : 5

15. Which of the following convert a matrix of phi coefficients to polychoric correlations ?

Correct Answer is : 3

16. Which of the following is used to plot multiple histograms ?

Correct Answer is : 16

17. Which of the following count the number of good cases when doing pairwise analysis ?

Correct Answer is : 1

18. Which of the following gives the summary of values likes mean etc ?

Correct Answer is : error

19. .The purpose of correct.cor is to correct _________ in values.

Correct Answer is : 1

20. In practice, Line of best fit or regression line is found when _____________

Correct Answer is : no output

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