Hello everyone,
I have 400 firms and I have closing prices for 5 months ( Nov 2018 ,Dec 2018, and Jan,Feb,march 2019). I would like to know how can I compute 1- ) the change in log stock prices from December 31, 2018 to March 31, 2019 and 2-) the change in log of average stock prices of November 30, 2018 and December 31, 2018 and average stock prices of February 28, 2019 and March 31, 2019. Please, how can I got /generate these TWO VARIABLES in stata ? Thanks a lot.