Specifies the fitting statistic.
sherpa> STATISTIC <sherpa_statisticname>
<sherpa_statisticname> is the name of one of the
supported fitting statistics:
STATISTIC Command Arguments
| BAYES | A Bayesian maximum likelihood function. |
| CASH | A maximum likelihood function. |
| {CHI CVAR | CHI PARENT} | Chi-square statistic with constant variance computed from the counts data. |
| CHI DVAR | Chi-square statistic with variance computed from the data. |
| CHI GEHRELS |
Chi-square statistic with the Gehrels variance function. |
| CHI MVAR | Chi-square statistic with variance computed from model amplitudes. |
| CHI PRIMINI | Chi-square statistic with Primini variance function. |
| CSTAT | A maximum likelihood function: XSPEC implementation of CASH |
| USERSTAT |
User-implemented statistic. |
The default statistic is
CHI GEHRELS. It is
the default because of its behavior in the low-counts regime.
The statistic that has been set in the current Sherpa session
may be listed with the command
SHOW STATISTIC.
See the Sherpa manual for more information.
Specify a fitting statistic to be used; report on it:
sherpa> STATISTIC BAYES
sherpa> SHOW STATISTIC
Statistic: Bayes
- sherpa
-
bayes,
cash,
chicvar,
chidvar,
chigehrels,
chimvar,
chiprimini,
chisquare,
cstat,
get_stat_expr,
truncate,
userstat
|
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