Evidence map›Paper›PMID 19638200›Full record

GuidelineBMC medical research methodology2009

Combining estimates of interest in prognostic modelling studies after multiple imputation: current practice and guidelines.

Andrea Marshall, Douglas G Altman, Roger L Holder, Patrick Royston

Abstract readPractice Guideline
In one paragraph

Guideline in BMC medical research methodology, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 449 papers, 4 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
449citing papers in PubMed, 4 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

449 citing papers in PubMed, 4 syntheses or guidelines pooled it.

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  6. Randomized controlled trial of emotion regulation therapy versus cognitive behavioral therapy to address distress in cancer caregivers.Annals of behavioral medicine : a publication of the Society of Behavioral Medicine · 2026
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389 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors.

Andrea MarshallCentre for Statistics in Medicine, University of Oxford, Oxford, UK. andrea.marshall@warwick.ac.uk
Douglas G Altman
Roger L Holder
Patrick Royston

Funding

Cancer Research UK
6 · The paper itself

Abstract

backgroundMultiple imputation (MI) provides an effective approach to handle missing covariate data within prognostic modelling studies, as it can properly account for the missing data uncertainty. The multiply imputed datasets are each analysed using standard prognostic modelling techniques to obtain the estimates of interest. The estimates from each imputed dataset are then combined into one overall estimate and variance, incorporating both the within and between imputation variability. Rubin's rules for combining these multiply imputed estimates are based on asymptotic theory. The resulting combined estimates may be more accurate if the posterior distribution of the population parameter of interest is better approximated by the normal distribution. However, the normality assumption may not be appropriate for all the parameters of interest when analysing prognostic modelling studies, such as predicted survival probabilities and model performance measures.

methodsGuidelines for combining the estimates of interest when analysing prognostic modelling studies are provided. A literature review is performed to identify current practice for combining such estimates in prognostic modelling studies.

resultsMethods for combining all reported estimates after MI were not well reported in the current literature. Rubin's rules without applying any transformations were the standard approach used, when any method was stated.

conclusionThe proposed simple guidelines for combining estimates after MI may lead to a wider and more appropriate use of MI in future prognostic modelling studies.

Indexed as

Computer SimulationData Interpretation, StatisticalLinear ModelsModels, StatisticalMultivariate AnalysisPrognosisHumansRandomized Controlled Trials as TopicStochastic Processes

Identifiers

PMID19638200
PMCPMC2727536

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.