create new columns xts
An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-sig-finance/attachments/20130623/fa72e2f5/attachment.pl>
An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-sig-finance/attachments/20130623/fa72e2f5/attachment.pl>