IVY_R_Final Assessment

The install.packages() command can be used to

• download and install packages from CRAN repositories

• download and install packages from local directories

• can install both from CRAN and local directories

• download and install packages which are not R libraries

We remove a trend from a time series data by applying

• Log

• Square root

• Difference

• All of the above

If “aaa”, “bbb” and “ccc” are three strings, then the command paste(“aaa”,”bbb”,”ccc”) will return a string

• “aaabbbccc”

• “aaa bbb”

• “aaa bbb ccc”

• “aaa-bbb-ccc”

C statistics or Area Uder Curve ranges from

• 0-1

• 0.2-1

• 0-4

• None of the above

If we have a dataset z which has two variables as follows:

x y

1 A

1 B

2 C

3 D

4 E

3 F

If you run the code z[duplicated(z$x),] then what will the values for x?

• 1,2,3

• 1,1,2

• 1,2,3,4

• None of the above

P value of 0.001 in a statistical test signifies that:

• Fail to reject Null Hypothesis

• Reject the Null Hypothesis

• Accept the Alternate hypothesis

• Reject the alternate hypothesis

We can get which of the following in the box plot?

• Mean

• Median

• Mode

• None of the above

R square will always be ______ than the adjusted R square

• Greater than

• Less than

• Greater than equals to

• Less than equals to

KS statistics of Logistic regression will range

• 0-1

• 0.5-1

• 0-4

• None of the above

A dataset x has 3 columns which are a, b, and c. If you want to drop the column c then which of the following code will work?

• x[, 3]

• x[-3]

• x[,-3]

• drop[x$3]