Tuesday, May 11, 2010

Likelihood Threshold Results

I've calculated the thresholds using the method outlined in yesterday's post. Calculating the likelihoods on the 43,134 targets in this 12 deg2 region took ~30 minutes (so that is quick).

Below are the thresholds for the old version of the likelihood (v1) in parentheses are the thresholds Adam Myers got:

Targets/deg2---------Threshold
10----------------0.995851
20----------------0.858535 (0.533)

30----------------0.664424

40----------------0.490932 (0.235)

50----------------0.400611

60----------------0.311577
70----------------0.256615

80----------------0.213374


So my thresholds still don't match his.

Here is a plot of deg2 vs threshold:



In terms of recovered QSOs with these thresholds:
Targets/deg2---Threshold-----Recovered QSOs (out of 1625)
10.0000 --- 0.995851 ------- 135 (8.3%)
20.0000
--- 0.858535 ------- 346 (21.3%)
30.0000
--- 0.664424 ------- 489 (30.1%)
40.0000
--- 0.490932 ------- 651 (40.1%)
50.0000
--- 0.400611 ------- 727 (44.7%)
60.0000
--- 0.311577 ------- 816 (50.2%)
70.0000
--- 0.256615 ------- 886 (54.5%)
80.0000
--- 0.213374 ------- 942 (58.0%)


I've saved these likelihoods in the directory: ../likelihood/likev1/
The they are also here:
likelihoodv1thresholds.fits
qsolikelihoodv1thresholds.fits
The log file is here: ../logs/100511log.pro

Now to make some magic happen...

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