## Command FIT

Parameters Defaults
FIT windows
/
LEASTSQUARES
POISSON
ZEROES
ERRANALYSIS
ITERATIONS(it) 10
TIME(tt) 60
LIST
NODISPLAY
**Purpose**
Perform fit of the specified function(s) to the data

## Parameter WINDOWS(wdws)

List of display window names or condition numbers or
**#** (for temporary window) defining the fit region.
If omitted the fit region is defined by the fit windows.
In any case only displayed data are fitted.

## Parameter LEASTSQUARES

Selects chi-square fitting with the least squares method.
This is the default.
Weighting factors are derived from the symmetrized errors in y-direction.

## Parameter POISSON

Selects fitting according to the maximum likelihood method.
With this method the y-value of each data point is assumed to follow
a Poisson distribution, which is appropriate for low counting rates.
**Not yet implemented**

## Parameter ZEROES

Include data points with y=0 in the fit. Normally such data are not considered.

## Parameter ERRANALYSIS

Perform an extensive analysis for the fit parameter (asymmetric) errors.
Might be time consuming !

## Parameter ITERATIONS(it)

Maximum number of iterations.

## Parameter TIME(tt)

Maximum amount of CPU time for a particular fit.
After expiration the iteration loop is aborted.
Unlimited time for **tt**<=0.

## Parameter LIST

List fit statistics each iteration

## Parameter NODISPLAY

Don't display intermediate fit curves