Changes between Version 10 and Version 11 of stacking_coverage.20130307

Timestamp:

Apr 17, 2013, 4:07:25 PM (13 years ago)

Author:

watersc1

Comment:

--

stacking_coverage.20130307

@@ -1 +1 @@
 == 2013-04-16 A ==
 
-I was able to track down the quadratic fit problem as a result of fitting data with outliers that span many orders of magnitude.  I put together a quick hack by taking the logarithm of the chi!^2 and flux values, and fitting the quadratic to that.  This greatly reduces the scatter found, and provides better fits to the actual data.  The following comparison image shows the original stack combination, the reduction with the improved input FWHM cuts (which introduced the chi^2 cut issue), the reduction with this logarithm hack, and finally a result with all of the previous improvements but now with SAFE = F.
+I was able to track down the quadratic fit problem as a result of fitting data with outliers that span many orders of magnitude.  I put together a quick hack by taking the logarithm of the chi!^2 and flux values, and fitting the quadratic to that.  This greatly reduces the scatter found, and provides better fits to the actual data.  The following comparison image shows the original stack combination, the reduction with the improved input FWHM cuts (which introduced the chi!^2 cut issue), the reduction with this logarithm hack, and finally a result with all of the previous improvements but now with SAFE = F.
 
 [[Image(coverage_comparison.jpg,800px)]]