Hi folks, Can anybody shed some insight on the procedure to use for calculating the variance of a weighted sum? Basically what I'm looking for is SAS 9.3 code to calculate var(z) in the following equation: var(z) = a^2[var(x)] + b^2[var(y)] a&b are the weights, x&y are the variables for which variance is to be calculated. More information can be provided if necessary. Thanks in advance for considering.
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