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Part 1: Document Description
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Citation |
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Title: |
Replication Data for: Why Propensity Scores Should Not Be Used for Matching |
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Identification Number: |
doi:10.7910/DVN/A9LZNV |
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Distributor: |
Harvard Dataverse |
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Date of Distribution: |
2019-01-28 |
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Version: |
1 |
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Bibliographic Citation: |
Nielsen, Richard; King, Gary, 2019, "Replication Data for: Why Propensity Scores Should Not Be Used for Matching", https://doi.org/10.7910/DVN/A9LZNV, Harvard Dataverse, V1 |
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Citation |
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Title: |
Replication Data for: Why Propensity Scores Should Not Be Used for Matching |
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Identification Number: |
doi:10.7910/DVN/A9LZNV |
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Authoring Entity: |
Nielsen, Richard (MIT) |
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King, Gary (Harvard University) |
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Producer: |
Political Analysis |
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Distributor: |
Harvard Dataverse |
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Access Authority: |
Nielsen, Richard |
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Depositor: |
Nielsen, Richard |
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Date of Deposit: |
2018-11-09 |
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Series Name: |
Volume #, Issue # |
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Holdings Information: |
https://doi.org/10.7910/DVN/A9LZNV |
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Study Scope |
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Keywords: |
Mathematical Sciences, Social Sciences, Matching; Propensity Score; Causal Inference; Observational Studies |
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Abstract: |
Abstract: We show that propensity score matching (PSM), an enormously popular method of preprocessing data for causal inference, often accomplishes the opposite of its intended goal — thus increasing imbalance, inefficiency, model dependence, and bias. The weakness of PSM comes from its attempts to approximate a completely randomized experiment, rather than, as with other matching methods, a more efficient fully blocked randomized experiment. PSM is thus uniquely blind to the often large portion of imbalance that can be eliminated by approximating full blocking with other matching methods. Moreover, in data balanced enough to approximate complete randomization, either to begin with or after pruning some observations, PSM approximates random matching which, we show, increases imbalance even relative to the original data. Although these results suggest researchers replace PSM with one of the other available matching methods, propensity scores have other productive uses. |
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Methodology and Processing |
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Sources Statement |
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Data Access |
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Notes: |
<a href="http://creativecommons.org/publicdomain/zero/1.0">CC0 1.0</a> |
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Other Study Description Materials |
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Related Publications |
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Citation |
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Title: |
Forthcoming, Political Analysis |
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Bibliographic Citation: |
Forthcoming, Political Analysis |
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Label: |
archive_psnot.zip |
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Text: |
Full replication archive. |
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Notes: |
application/zip |