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Re: st: RE: RE: Residuals in svy:intreg

From   Nick Cox <>
Subject   Re: st: RE: RE: Residuals in svy:intreg
Date   Fri, 1 Jun 2012 08:54:33 +0100

I think there are two levels to this.

For informal (e.g. graphical) analysis, nothing is fundamentally
different, so that absence of pattern is good news and presence of
pattern may make you think about whether the model can be improved.

For formal analysis, I don't know of any published procedures either,
but if you invented your own, simulation may be the most practical way
to establish their properties.

On Fri, Jun 1, 2012 at 8:49 AM, Ángel Rodríguez Laso
<> wrote:
> Dear Nick,
> Thank you for your answer.
> Unfortunately, after intensive search in the web I haven´t been able
> to find any document on the use of residuals in interval regression or
> the checking of assumptions of interval regression in the survey
> setting. Of the two references that Stata manual v11 gives for an
> introduction to interval regression  (Wooldridge, J. M. 2009.
> Introductory Econometrics: A Modern Approach. 4th ed. Cincinnati, OH:
> South-Western. Davidson, R., and J. G. MacKinnon. 2004. Econometric
> Theory and Methods. New York: Oxford University Press.), I've only had
> access to Wooldridge's and it does not say anything on how to use
> residuals in this context.
> I suppose the difficult part in calculating (observed-predicted
> values) is assigning values from which censoring takes place as
> observed values for individuals with censored data.
> Angel Rodriguez-Laso
> 2012/5/31 Nick Cox <>:
>> I doubt that this was the question, but I am assuming here that if you want residuals, then it's just an extra line calculating the residuals as difference between observed and predicted.
>> Nick
>> -----Original Message-----
>> From: [] On Behalf Of Nick Cox
>> Sent: 31 May 2012 11:09
>> To: ''
>> Subject: st: RE: Residuals in svy:intreg
>> Still true in 12.1.
>> I would guess rather that as residuals need some careful interpretation with -intreg-, StataCorp lets users make their own decisions about working with them.
>> If you can refer us to literature defining and using residuals carefully for -intreg-, that would strengthen the case for adding them to official Stata.
>> Nick
>> Ángel Rodríguez Laso
>> I'm working with Stata 9.2 for Windows.
>> I have to carry out an interval regression with survey data, because
>> there are top and bottom censored values. I've noticed Stata version
>> 9.2 does not provide residuals for this model. It calculates predicted
>> values, but if it does not provide (observed-predicted values), there
>> must be a good reason.
>> I understand that, because I'm in a survey environment, I do not have
>> to check for homoskedasticity of residuals and that they are not
>> expected to be independent. But residuals would still be useful to
>> check for model lack of fit (nonlinearity and presence for influential
>> points and outliers). Do you know of any alternatives?

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