Statalist


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

st: Date: Fri, 27 Nov 2009 13:54:00 -0500


From   Michael Crain <michaelcrain@hotmail.com>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   st: Date: Fri, 27 Nov 2009 13:54:00 -0500
Date   Fri, 27 Nov 2009 13:54:04 -0500 (EST)

I have a data set of 35 observations with the predictor variable (x1) using the Likert scale and y = 0 or 1. I run -logit- and -logistic- (Stata v 10) and get a result that says:

note: outcome = x1> 3 predicts data perfectly except for
      x1 == 3 subsample:
      x1 dropped and 28 obs not used

-logit- is dropping 28 of the 35 observations and is using only 7 observations for the logit model but I don't understand the theoretical reason for doing so. 


<!--
 /* Font Definitions */
 @font-face
	{font-family:"Cambria Math";
	panose-1:2 4 5 3 5 4 6 3 2 4;
	mso-font-charset:0;
	mso-generic-font-family:roman;
	mso-font-pitch:variable;
	mso-font-signature:-1610611985 1107304683 0 0 159 0;}
@font-face
	{font-family:Calibri;
	panose-1:2 15 5 2 2 2 4 3 2 4;
	mso-font-charset:0;
	mso-generic-font-family:swiss;
	mso-font-pitch:variable;
	mso-font-signature:-1610611985 1073750139 0 0 159 0;}
 /* Style Definitions */
 p.MsoNormal, li.MsoNormal, div.MsoNormal
	{mso-style-unhide:no;
	mso-style-qformat:yes;
	mso-style-parent:"";
	margin-top:0in;
	margin-right:0in;
	margin-bottom:10.0pt;
	margin-left:0in;
	line-height:115%;
	mso-pagination:widow-orphan;
	font-size:12.0pt;
	mso-bidi-font-size:11.0pt;
	font-family:"Times New Roman","serif";
	mso-fareast-font-family:Calibri;
	mso-fareast-theme-font:minor-latin;
	mso-bidi-font-family:"Times New Roman";
	mso-bidi-theme-font:minor-bidi;}
.MsoChpDefault
	{mso-style-type:export-only;
	mso-default-props:yes;
	font-size:12.0pt;
	mso-ansi-font-size:12.0pt;
	mso-fareast-font-family:Calibri;
	mso-fareast-theme-font:minor-latin;
	mso-bidi-font-family:"Times New Roman";
	mso-bidi-theme-font:minor-bidi;}
.MsoPapDefault
	{mso-style-type:export-only;
	margin-bottom:10.0pt;
	line-height:115%;}
@page Section1
	{size:8.5in 11.0in;
	margin:1.0in 1.0in 1.0in 1.0in;
	mso-header-margin:.5in;
	mso-footer-margin:.5in;
	mso-paper-source:0;}
div.Section1
	{page:Section1;}
-->


clear

input y x1

1 4

1 4

1 3

1 4

1 4

1 4

1 4

1 3

1 3

1 3

1 3

0 3

0 1

0 2

0 2

0 2

0 2

0 2

0 2

0 2

0 2

0 2

0 2

0 3

0 2

0 1

0 1

0 2

0 1

0 2

0 1

0 2

0 1

0 1

0 1

endscatter  y x1, jitter(5)


logit y x1

logistic y x1


 		 	   		  
_________________________________________________________________
Windows 7: I wanted simpler, now it's simpler. I'm a rock star.
http://www.microsoft.com/Windows/windows-7/default.aspx?h=myidea?ocid=PID24727::T:WLMTAGL:ON:WL:en-US:WWL_WIN_myidea:112009
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index