Commit ed0653a970a8e64222cf96812963d16c052fa099
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9e6fd31a
Add a "Known issue" about selecting a too coarse spatial (and spectral) binning.
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doc/source/issues.rst
| @@ -7,6 +7,7 @@ Below you will find a list of known issues. | @@ -7,6 +7,7 @@ Below you will find a list of known issues. | ||
| 7 | 7 | ||
| 8 | - :ref:`Broken power law has unreliable errors <issues_bplaw>` | 8 | - :ref:`Broken power law has unreliable errors <issues_bplaw>` |
| 9 | - :ref:`Errors become unreliable when fitting the pivot energy <issues_pivot>` | 9 | - :ref:`Errors become unreliable when fitting the pivot energy <issues_pivot>` |
| 10 | +- :ref:`Binned analysis is biased when using coarse binning <issues_binned>` | ||
| 10 | 11 | ||
| 11 | 12 | ||
| 12 | .. _issues_bplaw: | 13 | .. _issues_bplaw: |
| @@ -33,3 +34,15 @@ Below you will find a list of known issues. | @@ -33,3 +34,15 @@ Below you will find a list of known issues. | ||
| 33 | parameters of the model to assure non-degeneracy of the free | 34 | parameters of the model to assure non-degeneracy of the free |
| 34 | parameters. | 35 | parameters. |
| 35 | 36 | ||
| 37 | +.. _issues_binned: | ||
| 38 | + | ||
| 39 | +.. topic:: Binned analysis is biased when using coarse binning | ||
| 40 | + | ||
| 41 | + When performing a binned or stacked analysis you should make sure | ||
| 42 | + that the spatial and spectral binning is sufficiently fine grained. | ||
| 43 | + The spatial binning should be better than the best angular resolution | ||
| 44 | + over the energy range of interest. Use a typical value of 0.02 degrees. | ||
| 45 | + For the spectral binning, use at least 5 bins per decade. | ||
| 46 | + If the binning is too coarse, the spectral parameters will be biased. | ||
| 47 | + For example, a spectral hardening is observed when using a coarser | ||
| 48 | + spatial binning. |