Changes between Version 5 and Version 6 of UsageExamples

Timestamp:

Jan 30, 2017, 2:07:39 PM (8 years ago)

Author:

Clarence Wret

Comment:

--

UsageExamples

@@ -48 +48 @@
 Separating options with commas runs them in order, e.g. `-f Simplex,Combined` will first run a `Simplex` minimisation and then propagate those results to a `Combined` minimisation. 
 
+= Fake data studies with `nuismin` =
+
+`nuismin` supports fake-data studies for validation purposes. Its aim is to study fitting biases and general troubleshooting of parameter responses.
+
+Supply `-d MC` to the argument list to use the generator MC as fake-data. You can also specify reweight parameters for the fake-data in the card file by adding 
+
+{{{
+fake_parameter PARAM_NAME PARAM_VALUE
+}}}
+
+to the card file to reweight the generator output to some variation and set that to the data. The data will now be some parameter variation of the MC, and (hopefully) the fit routine will converge on this parameter.
+
+You can also specify `-d FILE_LOCATION.root` to set the fake-data to a MC histogram that has been previously produced through NUISANCE. 
+
+E.g. the output of a fit result to `ANL_CC1ppip_XSec_1DEnu_nu` will produce some output file `MyOutput.root`, containing a histogram `ANL_CC1ppip_XSec_1DEnu_nu_MC`. Feeding `nuismin` `-d MyOutput.root` in addition to a card file specifying `sample ANL_CC1ppip_XSec_1DEnu_nu MY_GENERATOR:GENERATOR_FILE_LOCATION.root` will find the `_MC` histogram in `MyOutput.root` and set it to the data in the new `nuismin` program.
+
+
+
 = Making a flat-tree from the generators =