PHP interview questions part 25
PHP interview questions part 25
Take as many assements as you can to improve your validate your skill rating
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
