Replication Data for: Looking for twins: how to build better counterfactuals with matching (doi:10.7910/DVN/CYZFCC)

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Part 2: Study Description
Part 3: Data Files Description
Part 4: Variable Description
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Replication Data for: Looking for twins: how to build better counterfactuals with matching

doi:10.7910/DVN/CYZFCC

Harvard Dataverse

2021-02-03

1

Costalli, Stefano; Negri, Fedra, 2021, "Replication Data for: Looking for twins: how to build better counterfactuals with matching", https://doi.org/10.7910/DVN/CYZFCC, Harvard Dataverse, V1, UNF:6:SJ66FQlNwe5Oywqkos9t5A== [fileUNF]

Replication Data for: Looking for twins: how to build better counterfactuals with matching

doi:10.7910/DVN/CYZFCC

Costalli, Stefano (Università degli Studi di Firenze)

Negri, Fedra (Università degli Studi di Milano)

Harvard Dataverse

Negri, Fedra

Negri, Fedra

2021-01-04

Social Sciences, selection bias, causation, statistical matching, coarsened exact matching, peacekeeping

A primary challenge for researchers that make use of observational data is selection bias (i.e., the units of analysis exhibit systematic differences and dis-homogeneities due to non-random selection into treatment). This article encourages researchers in acknowledging this problem and discusses how and - more importantly - under which assumptions they may resort to statistical matching techniques to reduce the imbalance in the empirical distribution of pre-treatment observable variables between the treatment and control groups. With the aim of providing a practical guidance, the article engages with the evaluation of the effectiveness of peacekeeping missions in the case of the Bosnian civil war, a research topic in which selection bias is a structural feature of the observational data researchers have to use, and shows how to apply the Coarsened Exact Matching (CEM), the most widely used matching algorithm in the fields of Political Science and International Relations.

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Costalli Stefano, and Negri Fedra (2021) 'Looking for twins: how to build better counterfactuals with matching', Italian Political Science Review/Rivista Italiana di Scienza Politica.

• Number of cases: 420

• No. of variables per record: 16

• Type of File: text/tab-separated-values

UNF:6:SJ66FQlNwe5Oywqkos9t5A==

• id
• municipality
• code
• year
• contig_hr
• contig_srb
• internal_bord
• nat_polar
• share_cultland
• pk_presence
• pk1dicot
• log_victims
• log_pop
• past_vict
• past_pkpres
• past_pk1dicot

f4285842 Location:

Summary Statistics: Max. 105.0; Min. 1.0; Mean 53.0; StDev 30.345661774694463; Valid 420.0

Variable Format: numeric

Notes: UNF:6:ODPNcgk3Zde5wHbcq9G2AA==

f4285842 Location:

Variable Format: character

Notes: UNF:6:H+VTUeRSmalNQI3Kb7JdqA==

f4285842 Location:

Summary Statistics: Valid 420.0; StDev 30.345661774694463; Max. 105.0; Mean 53.0; Min. 1.0

Variable Format: numeric

Notes: UNF:6:ODPNcgk3Zde5wHbcq9G2AA==

f4285842 Location:

Summary Statistics: Mean 1993.5; Min. 1992.0; StDev 1.119367363092245; Max. 1995.0; Valid 420.0

Variable Format: numeric

Notes: UNF:6:CnvGBVxA84rGQm0SSnvNpw==

f4285842 Location:

Summary Statistics: Min. 0.0; Valid 420.0; StDev 0.4074541272096821; Mean 0.20952380952380983; Max. 1.0;

Variable Format: numeric

Notes: UNF:6:h1UxZ3vzi44JBQQxChy8Gg==

f4285842 Location:

Summary Statistics: Max. 1.0; StDev 0.3066116159446064; Valid 420.0; Min. 0.0; Mean 0.10476190476190496;

Variable Format: numeric

Notes: UNF:6:wOTuz5AWEEgTYBPRYCaGig==

f4285842 Location:

Summary Statistics: Mean 0.48571428571428565; Valid 420.0; Min. 0.0; StDev 0.5003919363960896; Max. 1.0;

Variable Format: numeric

Notes: UNF:6:ke9E9ouc+DpI0nS4WYGZ3A==

f4285842 Location:

Summary Statistics: Max. 0.982829213142395; Min. 0.03590419888496399; StDev 0.234603442367488; Mean 0.7445826322904654; Valid 420.0;

Variable Format: numeric

Notes: UNF:6:K1tnwVxQBnVtMm+afat+HA==

f4285842 Location:

Summary Statistics: Mean 0.17261429886723195; Min. 0.0010833999840542674; StDev 0.15992419668273222; Max. 0.6733983755111694; Valid 416.0;

Variable Format: numeric

Notes: UNF:6:o0dm1wIwgkQbt05c0Ptkqw==

f4285842 Location:

Summary Statistics: Valid 420.0; Max. 1.0; StDev 0.37939754014116595; Min. 0.0; Mean 0.1738095238095237

Variable Format: numeric

Notes: UNF:6:Wc1vbByl4F5cbQi3nbimXA==

f4285842 Location:

Summary Statistics: Max. 1.0; Mean 0.11428571428571448; Min. 0.0; StDev 0.3185374007717454; Valid 420.0;

Variable Format: numeric

Notes: UNF:6:DuO6M85EJaobfA3hMgdKWw==

f4285842 Location:

Summary Statistics: Max. 8.66042709350586; Min. 0.0; Mean 4.3623551591657685; StDev 1.4516587837811865; Valid 416.0

Variable Format: numeric

Notes: UNF:6:xg/s5Ivg8Mg9eONXmg5lGQ==

f4285842 Location:

Summary Statistics: Valid 420.0; Mean 10.286541704904465; Max. 12.864582061767578; StDev 0.8060420842246652; Min. 8.331345558166504

Variable Format: numeric

Notes: UNF:6:WwLsO8A8ID1WT0VzXJj6aQ==

f4285842 Location:

Summary Statistics: Valid 386.0; Max. 8.427705764770508; StDev 1.8975992143725136; Mean 3.8377122026651014; Min. 0.0;

Variable Format: numeric

Notes: UNF:6:ApKGOWCn0Zg4i4ZiyHtytQ==

f4285842 Location:

Summary Statistics: Valid 420.0; Max. 1.0; Mean 0.09523809523809516; StDev 0.29389360579737517; Min. 0.0;

Variable Format: numeric

Notes: UNF:6:kkDYmggCkiraHN358m96Gg==

f4285842 Location:

Summary Statistics: StDev 0.2656190354350619; Valid 420.0; Max. 1.0; Min. 0.0; Mean 0.0761904761904762

Variable Format: numeric

Notes: UNF:6:zHR462w3Mo6irwGIZEfOPQ==

Label:

Replication_Costalli_Negri_IPSR2021.do

application/x-stata-syntax