https://stat.ethz.ch/CRAN/web/packages/nser/vignettes/daytoweek.html
daytoweek: Convert Daily OHLC data of a stock to Weekly data
of aconvertdailyohlcdata
https://mdotcors.michigan.gov/Xpos/API/qualityChecks/files/web/EN/5498_plots.htm
X-pos_96_TOLEDO_OHLC Quality Plots
xpostoledoohlcquality
https://stat.ethz.ch/CRAN/web/packages/nser/vignettes/daytomonth.html
daytomonth: Convert Daily OHLC data of a stock to Monthly data
of aconvertdailyohlcdata