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Use sample standard deviation for AMx. #105

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Aug 21, 2019
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Use sample standard deviation for AMx. #105

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5 changes: 3 additions & 2 deletions python/lsst/validate/drp/calcsrd/amx.py
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Original file line number Diff line number Diff line change
Expand Up @@ -208,9 +208,10 @@ def magInRange(cat):
continue

finiteEntries, = np.where(np.isfinite(distances))
# Need at least 2 distances to get a nonzero stdev
# Need at least 2 distances to get a finite sample stdev
if len(finiteEntries) > 1:
rmsDist = np.std(np.array(distances)[finiteEntries])
# ddof=1 to get sample standard deviation (e.g., 1/(n-1))
rmsDist = np.std(np.array(distances)[finiteEntries], ddof=1)
rmsDistances.append(rmsDist)

# return quantity
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