I am just starting to experiment with the party package and I am getting
strange results.  In the examples, the "statistic" and "criterion" seem
related, i.e. criterion is a 1-p.value and statistic is the test
statistic.  Higher statistics are associated with higher criteria
values.  When I run these models on my own dataset, the highest
statistic ends up getting a 0.00 criterion value and I get a "no valid
split" message.  Here are the results for my test run.

 

$statistic

           consbanner ShopSpecifically4Toys             ShopAlone 

          0.695049632           3.994070949           0.323828003 

         PlannedVisit           HolidayGift    ShoppingForInfants 

          5.959390531           1.215781494           0.008348165 

  ShoppingForToddlers          Shopping5To8         Shopping9To12 

          1.514564166           1.272472976           2.916720663 

      ShoppingForBoys      ShoppingForGirls 

          1.176195270           2.931369192 

 

$criterion

           consbanner ShopSpecifically4Toys             ShopAlone 

          0.234652500           0.999935052           0.253931746 

         PlannedVisit           HolidayGift    ShoppingForInfants 

          0.000000000           0.775931830           0.006660795 

  ShoppingForToddlers          Shopping5To8         Shopping9To12 

          0.870117187           0.796794880           0.996462676 

      ShoppingForBoys      ShoppingForGirls 

          0.760483146           0.996625285 

 

$maxcriterion

[1] 0.999935

 

 

PlannedVisit has the highest statistic but it's criterion is zeroed out.
If I run this model utilizing only the ShopSpecifically4Toys variable I
get the same statistic but it's criterion value is also zero.   Does
anyone know what might be causing this?  My dataset has 2250 cases.

 

I am using R version 2.4.0 (2006-10-03)

Copyright (C) 2006 The R Foundation for Statistical Computing

ISBN 3-900051-07-0

 

Platform - Windows XP sp2

 

 

Michael Conklin

Chief Methodologist - Advanced Analytics

 

MarketTools, Inc.

6465 Wayzata Blvd. Suite 170

Minneapolis, MN 55426

Tel: 952.417.4719 | Mobile:612.201.8978

Michael.Conklin@markettools.com <mailto:Michael.Conklin@markettools.com>


 

MarketTools(r)    http://www.markettools.com
<http://www.markettools.com/> 

 

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