Opened 12 years ago

Closed 10 years ago

#221 closed feature (fixed)

Propagation of errors in SANS reduction

Reported by: srkline Owned by: srkline
Priority: minor Milestone: Wish List
Component: SANS Reduction Keywords:
Cc: Blocking:
Task:

Description

From Lionel:

Can there be "proper" error propagation in the SANS Reduction that includes errors in transmissions, absolute scaling (Kappa), monitor counts, attenuators, systematic errors in sample concentration, contrast, plus anything else...

May be a difficult task to include everything, but the math may be enlightening as to the dominant error terms. Check the literature first (A. Brulet) first.

Change History (4)

comment:1 Changed 12 years ago by srkline

Maybe Bayesian analysis :-)

comment:2 Changed 12 years ago by ajj

  • Milestone changed from SANS Reduction Wish List to Wish List

comment:3 Changed 11 years ago by srkline

This has been done (r795)? and now the per-pixel error is propagated for the 2D case, and is output with the QxQy? ASCII data. The 1D data processing is unchanged.

Per-pixel count values are now assigned a proper standard deviation, even at low counts, so that error propagation can be taken through all of the data manipulation steps. Currently, the DIV file is treated as having zero error. For almost all cases, the errors in the experimental data sets will be orders of magnitude larger than the high counts of the DIV data.

comment:4 Changed 10 years ago by srkline

  • Resolution set to fixed
  • Status changed from new to closed

done. close it.

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