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From |
Steven Samuels <sjhsamuels@earthlink.net> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Increasing variance of dependent variable, logit, inter-rater agreement |

Date |
Fri, 27 Feb 2009 14:51:07 -0500 |

* How was the cut point y2b arrived at?

-Steve On Feb 26, 2009, at 8:30 PM, Supnithadnaporn, Anupit wrote:

Dear Stata List members,I am trying to learn what factors might determine the inter-rateragreementbetween the two tests of the same subject using differenttechnologies. One technology measures the characterisitcs of asubject and gives the result ofpass-fail (y1). The other technology gives the interval measurement (y2a) and the pass-fail (y2b) can be obtained using certain threshold. My simple idea is to use the logit regression of a dependent variablecalled 'agree' which takes value 1 if both tests yield the sameresults(y1=y2b) otherwise 0. agree = f(age, x1,x2,x3,...)The problem is that as 'age' increases, I know that the variance ofy2aalso increases. This is due to the nature (deterioration) of thesubjectitself. Given that the quality of the instrument measuring y2a isconstant,how should I take into account the increasing variance of y2a in mymodel?

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**References**:**st: Increasing variance of dependent variable, logit, inter-rater agreement***From:*"Supnithadnaporn, Anupit" <gtg065t@mail.gatech.edu>

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