See Part I to set up and load the data.
filter() dplyr verb
Filter returns only those observations (rows) which satisfy certain criteria.
Filtering rows for a single stock with
Here we use
filter to just pull out prices for XOM.
A common mistake is to use
= instead of
filter(ticker == ‘XOM’)
Filtering rows for multiple stocks with
Here we use %in% to match to multiple criteria. We pick out records for XOM and CVX.
filter(ticker %in% c(‘XOM’,’CVX’))
Visit Robot Wealth website to read the full article and download code: https://robotwealth.com/financial-data-manipulation-in-dplyr-for-quant-traders/
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