html/pontus/scm_description.php

   1   <h3 class="heading1">Description:</h3>
   2
   3     The Stepwise Covariate Model (SCM) building tool of PsN implements
   4     Forward Selection and Backward Elimination of covariates to a
   5     model. In short, one model for each relevant parameter-covariate
   6     relationship is prepared and tested in a univariate manner. In the
   7     first step the model that gives the best fit of the data according
   8     to some criteria is retained and taken forward to the next
   9     step. In the following steps all remaining parameter-covariate
  10     combinations are tested until no more covariates meet the criteria
  11     for being included into the model. The Forward Selection can be
  12     followed by Backward Elimination, which proceeds as the Forward
  13     Selection but reversely, using stricter criteria for model
  14     improvement.
  15     <br><br>
  16     The Stepwise Covariate Model building procedure is run by the scm
  17     utility. The options to the scm utility are of three diffrent
  18     types, first are the common options which works like the common
  19     options for all tools. Then are the SCM specific command line
  20     options. And last are options which have a more complex structures
  21     and are considered to cumbersome to specify on the command
  22     line. These options must therefore be specified in a separate
  23     configuration file. It is possible to provide values for all
  24     options, including the common options, in the configuration file
  25     but it should be noted that the command line overrides the
  26     configuration file, if an option is specified at both
  27     locations.
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