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From |
"Rajesh Tharyan" <R.Tharyan@exeter.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: comparing three gorups |

Date |
Sun, 7 Sep 2008 10:08:35 +0100 |

Hi, I suppose I have to say testparm _I*4 and then testparm _I*5 And then compare. Thanks rajesh -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Rajesh Tharyan Sent: 07 September 2008 09:50 To: statalist@hsphsun2.harvard.edu Subject: RE: st: comparing three gorups Hi maarten, Thanks very much.. that is very helpful. One of the variables is highly non normal but log transformation makes it reasonably close to normal. So I suppose I could do that. In the example you have created three groups based on rep78. A mvreg is run with mpg and trunk as the depvars with dummies for the three groups of rep78. The output shows that w.r.t mpg group 4 is more similar to group 3. w.r.t truck again group 4 is more similar to group 3. The parmest gives me an overall F. But how I do I interpret that w.r.t to mpg and trunk combines gp 4 is more similar to go 3. Thanks rajesh -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Maarten buis Sent: 07 September 2008 08:03 To: statalist@hsphsun2.harvard.edu Subject: Re: st: comparing three gorups --- Rajesh Tharyan <R.Tharyan@exeter.ac.uk> wrote: > I have 3 groups of companies, each group characterised by 2 variables > x and y, say groups A, B and c. What is the simplest way to test > whether A is similar to B or C in terms of these two variables? The example below will work when x and y are, conditional on your grouping variable, approximately normally distributed. *---------- begin example ---------- sysuse auto, clear recode rep78 1/2=3 xi: mvreg mpg trunk = i.rep78 testparm _I* *----------- end example ----------- Hope this helps, Maarten ----------------------------------------- Maarten L. Buis Department of Social Research Methodology Vrije Universiteit Amsterdam Boelelaan 1081 1081 HV Amsterdam The Netherlands visiting address: Buitenveldertselaan 3 (Metropolitan), room Z434 +31 20 5986715 http://home.fsw.vu.nl/m.buis/ ----------------------------------------- * * 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/ * * 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/ * * 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/

**References**:**st: comparing three gorups***From:*"Rajesh Tharyan" <R.Tharyan@exeter.ac.uk>

**Re: st: comparing three gorups***From:*Maarten buis <maartenbuis@yahoo.co.uk>

**RE: st: comparing three gorups***From:*"Rajesh Tharyan" <R.Tharyan@exeter.ac.uk>

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