BOOT N1 N2 N3 NCOPY SEED SET -- Copies a series of spectra, NCOPY times,
changes error bars to simulate bootstrap
selection of data points. Spectra can then
be used in a fit to generate error bars.
Parameters:
N1 -- Slot number of first spectrum to copy
N2 -- Slot number of last spectrum to copy
N3 -- First slot for copies
NCOPY -- Number of copies.
SEED -- Seed integer for random number generator
Enter 0 to carry on from old value.
SET -- Apply a mask
The bootstrap only operates on unmasked data and data with positive
error bars. If there are N valid points then N points are sampled
with replacement to work out how many times each new point will be
included in bootstrap analysis. If a point is not selected at all
then its error bar is made negative, otherwise the error bar is
divided by the square root of the number of times a point was picked.
With Chi**2 type weights, then the point is effectively used that number
of times in a fit.
Associated routines: noise, copy
This command belongs to the classes: fudging .