For example, a Sharpe ratio for the last 3 years conveys very different information than one for the last 10 (or better yet 7.) Morningstar does actually give this on their "Ratings and Risk" page.
Although harder to get, the most reliable help I have found is for 1 (or better yet 2) complete market cycles.
Finally, I find it helpful to examine (upside capture ratio)/(downside capture ratio) and again for longer time periods.
Comments
performance.morningstar.com/fund/ratings-risk.action?t=SSHFX®ion=USA&culture=en-us This is an example for Sound Shore fund.
In addition to using the statistics, it may be worthwhile to compare the performance over the past 5 years, particularly the down years (i.e. 2008 and 2011). If the fund goes back over 10 years, you probably want to look at 2000-2002. Then the comparison using upside and downside capture ratio make more sense.
https://www.google.com/search?q=economic+cycles+history&sa=X&hl=en&tbm=isch&tbo=u&source=univ&ei=mZOrUbH5Aebk4AP-y4G4CA&ved=0CDoQsAQ&biw=1024&bih=678#hl=en&tbm=isch&sa=1&q=market+cycles+history&oq=market+cycles+history&gs_l=img.12...37801.39485.0.41857.6.6.0.0.0.0.206.848.0j5j1.6.0...0.0...1c.1.15.img.mTfDlYeann4&bav=on.2,or.r_qf.&bvm=bv.47244034,d.dmg&fp=f2549f2fdf8e5d40&biw=1024&bih=678
https://www.google.com/search?q=economic+cycles+history&sa=X&hl=en&tbm=isch&tbo=u&source=univ&ei=mZOrUbH5Aebk4AP-y4G4CA&ved=0CDoQsAQ&biw=1024&bih=678