Evidence map›Paper›PMID 32154892›Full record

ArticleInternational journal of epidemiology2020

A causal inference perspective on the analysis of compositional data.

Kellyn F Arnold, Laurie Berrie, Peter W G Tennant, Mark S Gilthorpe

Abstract read
In one paragraph

Article in International journal of epidemiology, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers.

0numbers the graph read from it
0cells of the map it votes in
27citing papers in PubMed
–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

27 citing papers in PubMed.

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  10. Longitudinal associations of screen time, physical activity, and sleep duration with body mass index in U.S. youth.The international journal of behavioral nutrition and physical activity · 2024
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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

4 authors.

Kellyn F ArnoldLeeds Institute for Data Analytics, University of Leeds, Leeds, UK.
Laurie BerrieLeeds Institute for Data Analytics, University of Leeds, Leeds, UK.
Peter W G TennantLeeds Institute for Data Analytics, University of Leeds, Leeds, UK.
Mark S GilthorpeLeeds Institute for Data Analytics, University of Leeds, Leeds, UK.

Funding

Medical Research Council MR/K501402/1
6 · The paper itself

Abstract

backgroundCompositional data comprise the parts of some whole, for which all parts sum to that whole. They are prevalent in many epidemiological contexts. Although many of the challenges associated with analysing compositional data have been discussed previously, we do so within a formal causal framework by utilizing directed acyclic graphs (DAGs).

methodsWe depict compositional data using DAGs and identify two distinct effect estimands in the generic case: (i) the total effect, and (ii) the relative effect. We consider each in the context of three specific example scenarios involving compositional data: (1) the relationship between the economically active population and area-level gross domestic product; (2) the relationship between fat consumption and body weight; and (3) the relationship between time spent sedentary and body weight. For each, we consider the distinct interpretation of each effect, and the resulting implications for related analyses.

resultsFor scenarios (1) and (2), both the total and relative effects may be identifiable and causally meaningful, depending upon the specific question of interest. For scenario (3), only the relative effect is identifiable. In all scenarios, the relative effect represents a joint effect, and thus requires careful interpretation.

conclusionsDAGs are useful for considering causal effects for compositional data. In all analyses involving compositional data, researchers should explicitly consider and declare which causal effect is sought and how it should be interpreted.

Indexed as

CausalityConfounding Factors, EpidemiologicData Interpretation, Statisticalcausal inferencecollider biasCompositional datadirected acyclic graphsjoint effectsrelative effects

Identifiers

PMID32154892
PMCPMC7660155

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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.