15.37.30 Yerrors

The error bars on the Y values are used as weighting factors for the fit. If they are all 0.0 they are assumed to be 1.0. The resulting fit has error bars on the coefficients according to the assumed error bars on the Y values. X errors are not used in the fit. When a curve is generated, it will have error bars on the Y values if the fitted curve had non zero error bars. For some functions the final errors depend on the initial center of the expansion. This is set by specifying an offset (OFFSET=n). Generally best results are obtained with an offset in the middle of the data set.