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Conditional weighte...
Conditional weighted residuals (CWRES) : a model diagnostic for the FOCE method
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- Hooker, Andrew C. (författare)
- Uppsala universitet,Institutionen för farmaceutisk biovetenskap,Pharmacometrics Research Group
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- Staatz, Christine E (författare)
- Uppsala universitet,Avdelningen för farmakokinetik och läkemedelsterapi
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- Karlsson, Mats O (författare)
- Uppsala universitet,Avdelningen för farmakokinetik och läkemedelsterapi
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(creator_code:org_t)
- 2007-07-06
- 2007
- Engelska.
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Ingår i: Pharmaceutical research. - : Springer Science and Business Media LLC. - 0724-8741 .- 1573-904X. ; 24:12, s. 2187-2197
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Purpose Population model analyses have shifted from using the first order (FO) to the first-order with conditional estimation (FOCE) approximation to the true model. However, the weighted residuals (WRES), a common diagnostic tool used to test for model misspecification, are calculated using the FO approximation. Utilizing WRES with the FOCE method may lead to misguided model development/evaluation. We present a new diagnostic tool, the conditional weighted residuals (CWRES), which are calculated based on the FOCE approximation. Materials and Methods CWRES are calculated as the FOCE approximated difference between an individual’s data and the model prediction of that data divided by the root of the covariance of the data given the model. Results Using real and simulated data the CWRES distributions behave as theoretically expected under the correct model. In contrast, in certain circumstances, the WRES have distributions that greatly deviate from the expected, falsely indicating model misspecification. CWRES/WRES comparisons can also indicate if the FOCE estimation method will improve the results of an FO model fit to data. Conclusions Utilization of CWRES could improve model development and evaluation and give a more accurate picture of if and when a model is misspecified when using the FO or FOCE methods.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Farmaceutiska vetenskaper (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Pharmaceutical Sciences (hsv//eng)
Nyckelord
- Conditional estimation
- Model diagnostics
- Modeling
- Non-linear mixed effect models
- NONMEM
- Pharmacometrics
- Statistics
- Weighted residuals
- PHARMACY
- FARMACI
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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