      To complicate matters even more, correlation coefficients are notconstants, and they too will adjust over time. Some correlationcoefficients will remain constant for years or even decades, while othercorrelation coefficients will adjust on a daily, weekly, and monthly basis.Typically, the correlation coefficient between individual securities willadjust on a weekly to monthly basis. Correlation coefficients betweenmarket sectors will typically adjust on a monthly to yearly basis.Commodities will tend to adjust on a much broader time frame, spanning fromyears to decades. Broad industry averages, such as the Dow IndustrialAverage and the Nasdaq Composite index, tend to adjust anywhere from weeksto years.