RStudio

knitr::opts_chunk$set(echo = TRUE)

Overview

Here is a link to the text of these exercises.

Question 1

Calculate the mean and variance of the Ozone, Solar.R, Wind, and Temp variables for each month in the airquality dataset, ignoring NA values. Use summarize() first, then use summarize_at(). Note that arguments to summary functions can be passed as dots to summarize_at().

Strategy

Interpretation

Question 2

Calculate mean expression values for each nutrient in brauer_gene_exp. Calculate the values by sampling 1%, 10% and 50% of the rows. How do your numbers change at each threshold?

Strategy

Interpretation

Question 3

Join the brauer_gene_exp and yeast_prot_prop tables and calculate the mean codon adaptation index (CAI in yeast_prot_prop) for each molecular funtion (MF in brauer_gene_exp). Sort the results from largest to smallest mean CAI.