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st: xttobit error "number of quadrature points must be less than or equal to number of obs"


From   John Simpson <john.simpson@ualberta.ca>
To   statalist@hsphsun2.harvard.edu
Subject   st: xttobit error "number of quadrature points must be less than or equal to number of obs"
Date   Mon, 13 Jul 2009 19:40:06 -0600

Hello Stata Experts,

I am receiving a strange error when trying to run xttobit on a large set of panel data. Basically, when I enter:

xttobit agentsend generation genSQ genCU initial roundante spawncost spawndisc playdisc randomizelike randomizeafterplay treatment agentsendLag1 agentsendLag2 agentsendLag3 agentsendLag4 agentsendLag5, ll(1) ul(15000)

it spits back:

number of quadrature points must be less than or equal to number of obs

I'm thinking that something odd is going on because I have over 10 million observations as is shown by describe:

. describe

Contains data from /Users/jsimpson/Documents/workspace/SR6-COMBINED- dropALL-TOBIT.dta
  obs:    10,471,680
 vars:            25                          13 Jul 2009 19:27
 size:   806,319,360 (56.1% of memory free)
--------------------------------------------------------------------------------------------------------
              storage  display     value
variable name   type   format      label      variable label
--------------------------------------------------------------------------------------------------------
trialline       byte   %8.0g                  TrialLine#
population      byte   %8.0g                  Population#
environment     byte   %8.0g                  Environment#
roundante       int    %8.0g                  Round-Ante
spawncost       int    %8.0g                  Spawn Cost
spawndisc       byte   %8.0g                  Spawn Disc?
playdisc        byte   %8.0g                  Play Disc?
randomizelike   byte   %8.0g                  Randomize Like?
randomizeafte~y byte   %8.0g                  Randomize AfterPlay?
initial         int    %8.0g                  Initial-#
generation      byte   %8.0g                  Generation
agentsend       int    %8.0g                  #Agents-End
xPO             double %10.0g
xAPO            double %10.0g
xM              double %10.0g
xAM             double %10.0g
panelid         double %12.0g
treatment       byte   %9.0g
agentsendLag1   int    %9.0g
agentsendLag2   int    %9.0g
agentsendLag3   int    %9.0g
agentsendLag4   int    %9.0g
agentsendLag5   int    %9.0g
genSQ           int    %9.0g
genCU           float  %9.0g
--------------------------------------------------------------------------------------------------------
Sorted by:  panelid  generation

Any thoughts?

-John

John Simpson
Department of Philosophy
University of Alberta
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