%0 Journal Article %A Francis H. Trainer, Jr. %A Jess B. Yawitz %A William J. Marshall %T Holding period is the key to risk thresholds %D 1979 %R 10.3905/jpm.1979.408681 %J The Journal of Portfolio Management %P 48-54 %V 5 %N 2 %U https://jpm.pm-research.com/content/iijpormgmt/5/2/48.full.pdf