p_any cutoff

[satishastro]

Q. The value of the p_any cutoff, calculated in the following manner, can be used again to improve the best match or just to report in a paper to show the percentage of false detections.

You can calibrate a p_any cut-off with the following steps:

1. Create a offset catalogue to simulate random sky positions:
   nway-create-fake-catalogue.py --radius 40 COSMOS_XMM.fits COSMOS_XMM-fake.fits
2. Match the offset catalogue in the same way as this run:
   ../nway.py COSMOS_XMM-fake.fits :pos_err COSMOS_OPTICAL.fits 0.1 --out=examplenway.fits-fake.fits --radius 20 --prior-completeness 0.9
3. determining the p_any cutoff that corresponds to a false-detection rate
   nway-calibrate-cutoff.py examplenway.fits examplenway.fits-fake.fits

[JohannesBuchner]

That is true; I guess it should be stated clearer in the manual?