Data on monthly returns for S&P 500 companies between Jan 1991 and Apr 2021
sp500
A data frame with 364 rows and 268 columns:
- Date
Date, as a string, indicating the endpoint of the month
- IDX
Monthly return for the S&P 500 index
- AAPL, ABMD, ..., ZION
Monthly company returns, where variable name is the company stock ticker symbol
