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(gnuplot.info)error estimates

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 In `fit` (Note: fit ), the term "error" is used in two different contexts,
 data error estimates and parameter error estimates.

 Data error estimates are used to calculate the relative weight of each data
 point when determining the weighted sum of squared residuals, WSSR or
 chisquare.  They can affect the parameter estimates, since they determine
 how much influence the deviation of each data point from the fitted function
 has on the final values.  Some of the `fit` output information, including
 the parameter error estimates, is more meaningful if accurate data error
 estimates have been provided.

 The 'statistical overview' describes some of the `fit` output and gives some
 background for the 'practical guidelines'.

statistical overview

practical guidelines