Why do investors compare the returns of assets as opposed to the change factors of assets? (money.stackexchange.com)
Because of this, evaluating the performance of these unique funds is more difficult than say, comparing returns on two different large - cap funds. (afs401k.com)
Also, it's hard to compare returns from one fund to another in absolute returns because the amount invested and time - frames are often different. (relakhs.com)