What value does this statement return? unclass(as.Date("1971-01-01"))

What do you use to take an object such as a data frame out of the workspace?

The variable height is a numeric vector in the code below. Which statement returns the value 35?

Which choice does R regard as an acceptable name for a variable?

What is the principal difference between an array and a matrix?

Which is not a property of lists and vectors?

What is the output for the command: is.na(0/0)?

What R function can be used to tabulate values of categorical variable Y (columns) by categorical variable X (rows)?

Which function is used to load a CSV file into R?

What is the value of Y? X <- c(1,2,2,2,3,3,4,4,5,6); Y <- unique(X[which(X<4)])

Suppose we define X <- NA. What is the output for > is.nan( X ); is.na( X )