Source For Standard Deviation Data

Where does the historical data for standard deviations that are used in Monte Carlo come from?

For this data we use appoximately 40 years of historical data from these ETFs:

Cash: 1 Month CD Rate From Federal Reserve Data

Short Term Bonds: iShares Short Term Bond ETF (SHY)

Medium Term Bonds: iShares Medium Term Bond ETF (IEF)

Long Term Bonds: iShares Long Term Bond ETF (TLT)

Value Stocks: iShares Russell 1000 Value Index (IWD)

Growth Stocks: iShares Russell 1000 Growth Index (IWF)

International Developed Stocks: SPDR S&P World Ex-US (GWL)

Emerging Market Stocks: iShares MSCI Emerging Markets (EEM)

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