gs gs110 Nuts and Bolts and Getting Data In and Out - Reading Datasets - Quiz No.1
gs gs110 R Language Quiz
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Question 2: Point out the correct statement?
Character strings are entered using either matching double (“) or single (‘) quotes
Character vectors may be concatenated into a vector by the c() function
Subsets of the elements of a vector may be selected by appending to the name of the vector an index vector in square brackets
All of the mentioned
Question 3: What will be the output of the following R code?
> x <- 1:3 > y <- 10:12 > rbind(x, y) [,1] [,2] [,3] x 1 2 3 y 10 11 12 [,1] [,2] [,3] x 1 2 3 y 10 11 [,1] [,2] [,3] x 1 2 3 y 4 5 6 [,4] [,5] [,3] x 1 3 5 y 4 5 2
Question 4: What will be the output of the following R code?
> x <- list(1, "a", TRUE, 1 + 4i) > x [[1]] [1] 1 [[2]] [1] "a" [[3]] [1] TRUE [[4]] [1] 1+4i [[1]] [1] 2 [[2]] [1] "b" [[3]] [1] TRUE [[4]] [1] 1+4i [[1]] [1] 3 [[2]] [1] "a" [[3]] [1] TRUE [[4]] [1] 1+4i [[1]] [1] 77 [[2]] [1] "a" [[3]] [1] False [[4]] [1] 1+5i
Question 5: Point out the wrong statement?
matrices or more generally arrays are multi-dimensional generalizations of vectors
factors provide compact ways to handle categorical data
vectors provide a convenient way to return the results of a statistical computation
lists can be explicitly created using the list() function
Question 6: Which of the following is valid assignment?
> x <- fact(c("yes", "yes", "no", "yes", "no")) > x <- factor(c("yes", "yes", "no", "yes", "no")) > x <- factor(factor("yes", "yes", "no", "yes", "no")) > x <- factor(factor("yes", "no", "no", "yes", "no"))
Question 8: What will be the output of the following R code?
> x <- factor(c("yes", "yes", "no", "yes", "no")) > table(x) no yes 2 3 yes no 2 3 no yes 2 2 yes yes 6 2
Question 9: Which of the following code snippet will create a vector with NAs in it?
x >- c(1, 2, NA, 10, 3)
x >- cNA(1, 2, NA, 10, 3)
x >- NA(1, 2, NA, 10, 3)
x >- NA(1, 5, NA, 10, 8)
Question 10: What will be the output of the following R code?
> x <- c(1, 2, NaN, NA, 4) > is.na(x)
FALSE FALSE TRUE TRUE FALSE
FALSE TRUE TRUE TRUE FALSE
TRUE FALSE TRUE TRUE FALSE
TRUE FALSE TRUE FALSE FALSE
