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S&P/Experian First Mortgage Default Index is at 0.74%, compared to 0.72% last month and 0.84% last year. This is lower than the long term average of 1.91%. Category: Household Assets and Liabilities.
Standard Deviation. When you say that an investment like a stock market index fund has an expected return of 9%, you're saying that in any year there is a chance that your return will be better than 9% and a chance that it will be worse.ou can just think of standard deviation as being synonymous with volatility. An S&P 500 index fund has a standard deviation of about 15%; a standard deviation of zero would mean an investment has a return rate that never varies, like a bank account paying compound interest at a guaranteed rate.