How is the standard error of the least squares means found in Fit Model multiple regressionJMP supplies a standard error for its least squares means in the Least Squares Mean Table. How is this standard error calculated given that the least squares mean is a constant using the rules that JMP follows for calculating the least squares means? That is, JMP fixes background continuous variables at their mean and sums over background categorical variables using equal weighting (which is equivalent to ignoring them because they always sum to zero under this approach).
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