Cited by 944Meta-analysis and systematic reviewsPsychology Research and BibliometricsReliability and Agreement in Measurement

Many Labs 2: Investigating variation in replicability across samples and settings

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Klein, Richard A., Vianello, Michelangelo, Hasselman, Fred, Adams, Byron G., Adams, Reginald B., Alper, Sinan, Aveyard, Mark, Axt, Jordan R. +182 more·2018·Advances in Methods and Practices in Psychological Science

Abstract

We conducted preregistered replications of 28 classic and contemporary published findings, with protocols that were peer reviewed in advance, to examine variation in effect magnitudes across samples and settings. Each protocol was administered to approximately half of 125 samples that comprised 15,305 participants from 36 countries and territories. Using the conventional criterion of statistical significance ( p < .05), we found that 15 (54%) of the replications provided evidence of a statistically significant effect in the same direction as the original finding. With a strict significance criterion ( p < .0001), 14 (50%) of the replications still provided such evidence, a reflection of the extremely high-powered design. Seven (25%) of the replications yielded effect sizes larger than the original ones, and 21 (75%) yielded effect sizes smaller than the original ones. The median comparable Cohen’s ds were 0.60 for the original findings and 0.15 for the replications. The effect sizes were small (< 0.20) in 16 of the replications (57%), and 9 effects (32%) were in the direction opposite the direction of the original effect. Across settings, the Q statistic indicated significant heterogeneity in 11 (39%) of the replication effects, and most of those were among the findings with the largest overall effect sizes; only 1 effect that was near zero in the aggregate showed significant heterogeneity according to this measure. Only 1 effect had a tau value greater than .20, an indication of moderate heterogeneity. Eight others had tau values near or slightly above .10, an indication of slight heterogeneity. Moderation tests indicated that very little heterogeneity was attributable to the order in which the tasks were performed or whether the tasks were administered in lab versus online. Exploratory comparisons revealed little heterogeneity between Western, educated, industrialized, rich, and democratic (WEIRD) cultures and less WEIRD cultures (i.e., cultures with relatively high and low WEIRDness scores, respectively). Cumulatively, variability in the observed effect sizes was attributable more to the effect being studied than to the sample or setting in which it was studied.

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  • Attention paid to positive, novel, and clean findings may contribute to publication bias, selective reporting, and questionable research practices that reduce the credibility of the published literature.

    “This may contribute to publication bias, selective reporting, and questionable research practices that reduce the credibility of the published literature 18-25 .”

    From Initial evidence of research quality of registered reports compared with the standard publishing model (2021) · cites this paper as [22]

    The Implications section says positive results are perceived as more publishable and describes analytic and post hoc practices that can inflate false positives and diminish credibility. The Discussion also identifies publication bias and p-hacking as possible explanations for replication failures, but says the study cannot determine whether they caused those failures. Our copy does not connect attention to novel or clean findings specifically to these practices. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Heterogeneity is not uncommon, even if it is relatively small, in multisite replications in which heterogeneity can be directly estimated.

    “Such heterogeneity is not uncommon, even if it is relatively small, in multisite replications in which heterogeneity can be directly estimated (Ebersole et al., 2020; Klein et al., 2018)”

    From Investigating the replicability of preclinical cancer biology (2021) · cites this paper as Klein et al., 2018

  • Many Labs projects yielded variable rates of replication success.

    “Using similar criteria, the”
  • Samples were categorized as Western or non-Western using previously established geographical categorizations.

    “Based on sample country or region, we categorized samples as Western or non-Western using previously established geographical categorizations [23,24].”
  • Among humans, different cultures and social groups differ in their moral foundations.

    “Among humans, different cultures and social groups differ in their moral foundations.”

    From Exploring the psychology of LLMs’ moral and legal reasoning (2024) · cites this paper as Klein et al., 2018

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  1. Rosenberg, M. (1965). Society and the adolescent selfimage . Princeton, NJ: Princeton University Press.
  2. N : A comment on Simonsohn's (2015) 'small telescopes.' Psychological Science , 27 , 1407-1409. doi:10.1177/0956 797616653102 · DOI

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Klein, R. A., Vianello, M., Hasselman, F., Adams, B. G., Adams, R. B., Alper, S., Aveyard, M., Axt, J. R., Babalola, M. T., Bahník, Š., Batra, R., Berkics, M., Bernstein, M. J., Berry, D. R., Bialobrzeska, O., Binan, E. D., Bocian, K., Brandt, M. J., Busching, R., Rédei, A. C., Cai, H., Cambier, F., Cantarero, K., Carmichael, C. L., Ceric, F., Chandler, J., Chang, J.-H., Chatard, A., Chen, E. E., Cheong, W., Cicero, D. C., Coen, S., Coleman, J. A., Collisson, B., Conway, M. A., Corker, K. S., Curran, P. G., Cushman, F., Dagona, Z. K., Dalgar, I., Dalla Rosa, A., Davis, W. E., de Bruijn, M., De Schutter, L., Devos, T., de Vries, M., Doğulu, C., Dozo, N., Dukes, K. N., Dunham, Y., Durrheim, K., Ebersole, C. R., Edlund, J. E., Eller, A., English, A. S., Finck, C., Frankowska, N., Freyre, M.-Á., Friedman, M., Galliani, E. M., Gandi, J. C., Ghoshal, T., Giessner, S. R., Gill, T., Gnambs, T., Gómez, Á., González, R., Graham, J., Grahe, J. E., Grahek, I., Green, E. G. T., Hai, K., Haigh, M., Haines, E. L., Hall, M. P., Heffernan, M. E., Hicks, J. A., Houdek, P., Huntsinger, J. R., Huynh, H. P., IJzerman, H., Inbar, Y., Innes-Ker, Å. H., Jiménez-Leal, W., John, M.-S., Joy-Gaba, J. A., Kamiloğlu, R. G., Kappes, H. B., Karabati, S., Karick, H., Keller, V. N., Kende, A., Kervyn, N., Knežević, G., Kovacs, C., Krueger, L. E., Kurapov, G., Kurtz, J., Lakens, D., Lazarević, L. B., Levitan, C. A., Lewis, N. A., Lins, S., Lipsey, N. P., Losee, J. E., Maassen, E., Maitner, A. T., Malingumu, W., Mallett, R. K., Marotta, S. A., Međedović, J., Mena-Pacheco, F., Milfont, T. L., Morris, W. L., Murphy, S. C., Myachykov, A., Neave, N., Neijenhuijs, K., Nelson, A. J., Neto, F., Lee Nichols, A., Ocampo, A., O’Donnell, S. L., Oikawa, H., Oikawa, M., Ong, E., Orosz, G., Osowiecka, M., Packard, G., Pérez-Sánchez, R., Petrović, B., Pilati, R., Pinter, B., Podesta, L., Pogge, G., Pollmann, M. M. H., Rutchick, A. M., Saavedra, P., Saeri, A. K., Salomon, E., Schmidt, K., Schönbrodt, F. D., Sekerdej, M. B., Sirlopú, D., Skorinko, J. L. M., Smith, M. A., Smith-Castro, V., Smolders, K. C. H. J., Sobkow, A., Sowden, W., Spachtholz, P., Srivastava, M., Steiner, T. G., Stouten, J., Street, C. N. H., Sundfelt, O. K., Szeto, S., Szumowska, E., Tang, A. C. W., Tanzer, N., Tear, M. J., Theriault, J., Thomae, M., Torres, D., Traczyk, J., Tybur, J. M., Ujhelyi, A., van Aert, R. C. M., van Assen, M. A. L. M., van der Hulst, M., van Lange, P. A. M., van ’t Veer, A. E., Vásquez- Echeverría, A., Ann Vaughn, L., Vázquez, A., Vega, L. D., Verniers, C., Verschoor, M., Voermans, I. P. J., Vranka, M. A., Welch, C., Wichman, A. L., Williams, L. A., Wood, M., Woodzicka, J. A., Wronska, M. K., Young, L., Zelenski, J. M., Zhijia, Z., & Nosek, B. A.
Affiliations
  • Laboratoire Inter-universitaire de Psychologie: Personnalité, Cognition, Changement Social (FR)
  • University of Padua (IT)
  • Radboud University Nijmegen (NL)
  • Tilburg University (NL)
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Corresponding author
Klein, Richard A.
ORCID
Venue
Advances in Methods and Practices in Psychological Science
Published
2018-12
Volume
1
Issue
4
Pages
443-490
ISSN
  • 2515-2459 (ISSN-L)
  • 2515-2467
OpenAlex
W2776961836
Cited by
944
References
142
Citations by year
2026: 44 · 2025: 76 · 2024: 119 · 2023: 147 · 2022: 135 · 2021: 152 · 2020: 155 · 2019: 103 · 2018: 9 · 2017: 1 · 2016: 1 · 2013: 2
FWCI
79.88
Type
journal article
Language
en
Open access
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  • Advances in Methods and Practices in Psychological Science (publishedVersion)
  • London School of Economics and Political Science Research Online (London School of Economics and Political Science) (acceptedVersion)
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Funders
Association for Psychological Science
Topics
  • Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Meta-analysis and systematic reviews
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Psychology Research and Bibliometrics
  • Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Reliability and Agreement in Measurement
Keywords
replication, effect size heterogeneity, setting effects, pre-registered replication

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