I demonstrate short R examples - summarise a data frame group by a column and a quick way of implementing simulation

Produce gross returns, standard deviation and correlation for several shares in R by reading and combining multiple downloaded stock price files.

Download stock price data from Google in R and merge it into one data frame in memory, avoiding the slower route of saving each file to a local drive.

This article illustrates how to download stock price data files from Google, save it into a local drive and merge them into a single data frame.