synopsis: derivation of the weighted standard deviation of the weighted mean signal per chopper plateau. This standard deviation will be used as the statistical uncertainty of the weighted mean signal.
limitations and applicability:
no limitations, always applied.
description:
Computation of the weighted mean of all valid signals on a chopper plateau
or raster point (a staring measurement is regarded as one single chopper
plateau).
purpose data reduction step:
Determination weighted mean signal and statistical uncertainty.
uncertainty/noise introduced:
(sect. 3.5) is used as weight. Ramps with
only 2 valid read-outs are weighted out since their weight have been
set to zero. If all ramps in a measurement have 3 non-destructive
read-outs per ramp (see section 3.5) all signals get the
same weight by setting all weights to 1. This processing step yields the
statistical uncertainty in the signal distribution.
auxillary data:
Number of valid signals on the plateau for averaging.