HEASARC Staff Scientist Position - Applications are now being accepted for a Staff Scientist with significant experience and interest in the technical aspects of astrophysics research, to work in the High Energy Astrophysics Science Archive Research Center (HEASARC) at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD. Refer to the AAS Job register for full details.
lrt
likelihood ratio test between two models
Tcl script to perform a likelihood ratio test between two models.
Syntax: lrt <niter><model0_name><model1_name>[<filename>]
Runs <niter> simulations of datasets based on <model0_name>,
calculates the likelihood ratio for <model1_name> relative to
<model0_name> (calculated by the statistic for <model0_name>
minus the statistic for <model1_name>), and outputs the fraction of
iterations with the likelihood ratio smaller than that for the data. If the
optional filename is given then the simulation results are written to the file.
The first line of the file contains the results for the data, the other lines
the simulations. Each line comprises the statistic values for <model0_name>,
the statistic value for <model1_name>, and the difference.
Before running this procedure you must have created command files called
<model0_name>.xcm and <model1_name>.xcm which define the
two models. A good way to do this is to set up the model then use save
model to make the command file.
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Last modified: Friday, 23-Aug-2024 13:20:40 EDT
HEASARC Staff Scientist Position - Applications are now being accepted for a Staff Scientist with significant experience and interest in the technical aspects of astrophysics research, to work in the High Energy Astrophysics Science Archive Research Center (HEASARC) at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD. Refer to the AAS Job register for full details.
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