Evidence map›Paper›PMID 28854202›Full record

ArticlePloS one2017

Formation of homophily in academic performance: Students change their friends rather than performance.

Ivan Smirnov, Stefan Thurner

Erratum issuedOpen access · goldAbstract read
In one paragraph

Article in PloS one, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 23 papers.

0numbers the graph read from it
0cells of the map it votes in
23citing papers in PubMed
4.0field-weighted citation impact, top 6% of its field
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

23 citing papers in PubMed, 81 citations in OpenAlex.

  1. Article
  2. Homophily within and across groups.Nature communications · 2025
    Article
  3. Why more social interactions lead to more polarization in societies.Proceedings of the National Academy of Sciences of the United States of America · 2025
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  4. Children's social preference for teachers versus peers in autism inclusion classrooms: An objective perspective.Autism research : official journal of the International Society for Autism Research · 2025
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  13. Empirical social triad statistics can be explained with dyadic homophylic interactions.Proceedings of the National Academy of Sciences of the United States of America · 2022
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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

2 authors at 2 institutions in 3 countries.

Ivan SmirnovInstitute of Education, National Research University Higher School of Economics, Moscow, Russia.
Stefan ThurnerSection for Science of Complex Systems, Medical University of Vienna, Vienna, Austria.ORCID http://orcid.org/0000-0003-2495-6819
National Research University Higher School of Economics · RUSanta Fe Institute · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Homophily, the tendency of individuals to associate with others who share similar traits, has been identified as a major driving force in the formation and evolution of social ties. In many cases, it is not clear if homophily is the result of a socialization process, where individuals change their traits according to the dominance of that trait in their local social networks, or if it results from a selection process, in which individuals reshape their social networks so that their traits match those in the new environment. Here we demonstrate the detailed temporal formation of strong homophily in academic achievements of high school and university students. We analyze a unique dataset that contains information about the detailed time evolution of a friendship network of 6,000 students across 42 months. Combining the evolving social network data with the time series of the academic performance (GPA) of individual students, we show that academic homophily is a result of selection: students prefer to gradually reorganize their social networks according to their performance levels, rather than adapting their performance to the level of their local group. We find no signs for a pull effect, where a social environment of good performers motivates bad students to improve their performance. We are able to understand the underlying dynamics of grades and networks with a simple model. The lack of a social pull effect in classical educational settings could have important implications for the understanding of the observed persistence of segregation, inequality and social immobility in societies.

Indexed as

Educational MeasurementFriendsInterpersonal RelationsPeer GroupSocial NetworkingAlgorithmsFemaleHumansMaleModels, TheoreticalSchoolsSocial EnvironmentSocial SupportStudentsUniversities

Identifiers

PMID28854202
PMCPMC5576666
OpenAlexW2461147385

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

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.