R Questions Set 24:
The R package _____ lets you perform SQL queries on your data frames.
Solution:
R objects can have attributes, which are like ________ for the object
Solution:
A _____ is an R object that can contain elements of different data types.
Solution:
Which of the following functions generate random Poisson variates with a given rate?
Solution:
Which of the following produces bivariate scatterplots or time-series plots?
Solution:
How many coefficients do you need to estimate in a simple linear regression model with one independent variable?
Solution:
Which function computes the time (in seconds) needed to execute an expression?
Solution:
What will be the output of the following R code?
> x <- c(1, 2, NaN, NA, 4)
> is.na(x)
Solution:
Which of the following statements about R is incorrect?
Solution:
function(p) {
params[!fixed] <- p
mu <- params[1]
sigma <- params[2]
## Calculate the Normal density
a <- -0.5*length(data)*log(2*pi*sigma^2)
b <- -0.5*sum((data-mu)^2) / (sigma^2)
-(a + b)
}
> ls(environment(nLL))
Solution:
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