Dieter is correct, the lengths of the 2 series are different Try ....
s = merge(s1,s2) corr = cor(s[,"Close.s1"],s[,"Close.s2"],use="pairwise.complete.obs") print(corr) HTH Pete -- View this message in context: http://r.789695.n4.nabble.com/Finding-the-correlation-coefficient-of-two-stocks-tp3246992p3247261.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
