You'd think it should be mentioned in Excel's online help, but it
ain't.
Trial & error shows LINEST and LOGEST functions support 16 sets of
independent variables but return errors when passed more than 16. As
for the number of observations, it supports more than 1,000.
The limit appears to be 17 coefficients, which would be 16 x variables if an
intercept is estimated, or 17 x varaibles if no intercept is estimated.
Jerry
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