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Correction to: Applied comparison of large-scale propensity score matching and cardinality matching for causal inference in observational research

The Original Article was published on 24 May 2021

Correction to: BMC Med Res Methodol 21, 109 (2021)

https://doi.org/10.1186/s12874-021-01282-1

Following publication of the original article [1], the authors noticed an error in Fig. 2, and some cropping of the text in Fig. 3. Presented here are the updated Figs. 2 and 3. The original article has been updated.

Fig. 2
figure1

Matching covariate standardized mean differences after large-scale propensity score matching (PSM) and cardinality matching (CM). Fine balance: exact marginal distributional balance. Violin plots illustrate kernel probability density; the width of the shaded area represents the proportion of observations with the corresponding y-axis value

Fig. 3
figure2

Candidate covariate standardized mean differences after large-scale propensity score matching (PSM) and cardinality matching (CM). Fine balance: exact marginal distributional balance. Violin plots illustrate kernel probability density; the width of the shaded area represents the proportion of observations with the corresponding y-axis value

Reference

  1. 1.

    Fortin SP, Johnston SS, Schuemie MJ. Applied comparison of large-scale propensity score matching and cardinality matching for causal inference in observational research. BMC Med Res Methodol. 2021;21(1):109. https://doi.org/10.1186/s12874-021-01282-1.

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Correspondence to Stephen P. Fortin.

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Fortin, S.P., Johnston, S.S. & Schuemie, M.J. Correction to: Applied comparison of large-scale propensity score matching and cardinality matching for causal inference in observational research. BMC Med Res Methodol 21, 174 (2021). https://doi.org/10.1186/s12874-021-01365-z

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