[Limdep Nlogit List] Varying number of alternatives

Mylene.Lagarde at lshtm.ac.uk Mylene.Lagarde at lshtm.ac.uk
Sun Aug 16 03:33:51 EST 2009 

NaN. 
NaN. 
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Name="Medium Shading 2 Accent 6"/>  <w:LsdException Locked="false" Priority="65" SemiHidden="false"   UnhideWhenUsed="false" Name="Medium List 1 Accent 6"/>  <w:LsdException Locked="false" Priority="66" SemiHidden="false"   UnhideWhenUsed="false" Name="Medium List 2 Accent 6"/>  <w:LsdException Locked="false" Priority="67" SemiHidden="false"   UnhideWhenUsed="false" Name="Medium Grid 1 Accent 6"/>  <w:LsdException Locked="false" Priority="68" SemiHidden="false"   UnhideWhenUsed="false" Name="Medium Grid 2 Accent 6"/>  <w:LsdException Locked="false" Priority="69" SemiHidden="false"   UnhideWhenUsed="false" Name="Medium Grid 3 Accent 6"/>  <w:LsdException Locked="false" Priority="70" SemiHidden="false"   UnhideWhenUsed="false" Name="Dark List Accent 6"/>  <w:LsdException Locked="false" Priority="71" SemiHidden="false"   UnhideWhenUsed="false" Name="Colorful Shading Accent 6"/>  <w:LsdException Locked="false" Priority="72" SemiHidden="false"   UnhideWhenUsed="false" Name="Colorful List Accent 6"/>  <w:LsdException Locked="false" Priority="73" SemiHidden="false"   UnhideWhenUsed="false" Name="Colorful Grid Accent 6"/>  <w:LsdException Locked="false" Priority="19" SemiHidden="false"   UnhideWhenUsed="false" QFormat="true" Name="Subtle Emphasis"/>  <w:LsdException Locked="false" Priority="21" SemiHidden="false"   UnhideWhenUsed="false" QFormat="true" Name="Intense Emphasis"/>  <w:LsdException Locked="false" Priority="31" SemiHidden="false"   UnhideWhenUsed="false" QFormat="true" Name="Subtle Reference"/>  <w:LsdException Locked="false" Priority="32" SemiHidden="false"   UnhideWhenUsed="false" QFormat="true" Name="Intense Reference"/>  <w:LsdException Locked="false" Priority="33" SemiHidden="false"   UnhideWhenUsed="false" QFormat="true" Name="Book Title"/>  <w:LsdException Locked="false" Priority="37" Name="Bibliography"/>  <w:LsdException Locked="false" Priority="39" QFormat="true" Name="TOC Heading"/> </w:LatentStyles><![endif]--> /* Style Definitions */ table.MsoNormalTable{mso-style-name:"Table Normal";mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-style-noshow:yes;mso-style-priority:99;mso-style-qformat:yes;mso-style-parent:"";mso-padding-alt:0cm 5.4pt 0cm 5.4pt;mso-para-margin-top:0cm;mso-para-margin-right:0cm;mso-para-margin-bottom:10.0pt;mso-para-margin-left:0cm;line-height:115%;mso-pagination:widow-orphan;font-size:11.0pt;font-family:"Calibri","sans-serif";mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:"Times New Roman";mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;}<![endif]-->HI,
I am trying to analyse a dataset where individuals have had to make a choice between a number of alternatives, but the number of alternatives varies from one individual to another - i.e. sometimes 4 of them (car / train / plane / bus), sometimes 3 of them, or even only 2.
I would like to estimate a mixed logit model, but don't know how to specify it that the choices individuals are faced with change for each choice set to the other. If I use the syntax "choices= car , train , plane , bus", then it doesn't work and I get the following error message:


  Error  1004: Number of observations not a multiple of # of alternatives.


How can I solve the problem?


Many thanks


Mylene

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