jar-methods

Research Design & Identification (jar-methods)

When to trigger

• The design is a panel regression with no source of identifying variation
• The claim is causal but the variation is observational/endogenous
• A referee says "this is correlation, not causation" or "the channel is unidentified"
• You must choose between an archival, experimental, analytical, or field design

JAR's dominant design: empirical-archival capital markets

JAR's defining methodology is large-sample empirical-archival capital-markets research (financial-statement and market-data econometrics in the Ball-Brown lineage). The journal also publishes experimental, analytical/modeling, and field-study work, and the Registered Reports track is well suited to higher-outcome-risk designs that require new data collection. The bar across all of them is credible identification: a referee must believe the estimate reflects the economic effect you claim, not an omitted variable, reverse causality, or selection.

Find identifying variation (the core archival problem)

Theoretical claim	Identification that earns it
Effect of a rule/standard	Staggered or sharp adoption as a natural experiment (modern DiD)
Effect at a threshold	Regression discontinuity (e.g., index inclusion, size cutoffs)
Effect of an endogenous firm choice	IV/2SLS with a defensible instrument, or a shock to the choice
Information content of a disclosure	Short-window event study around the release
Causal mechanism under control	Experiment (lab/online/field), often paired with archival evidence

• Anticipate the threats by name: omitted correlated variables, reverse causality, selection into treatment, and measurement error. State which one is the binding concern and how the design neutralizes it.
• Parallel trends / pre-trends for DiD; bandwidth and manipulation tests for RD; instrument relevance and exclusion for IV — plan the diagnostics now, not in the rebuttal.
• Construct measurement: define accounting constructs (earnings quality, disclosure, audit quality, comparability) with measures used in prior JAR work, and plan validation.

Sample and reproducibility from the start

Specify the sample frame, screens, and data vintages (Compustat/CRSP/I/B/E/S/Audit Analytics/EDGAR). Because JAR requires posted data and code, design the pipeline to be top-to-bottom reproducible from raw extracts, recording exclusion rules and access dates.

Checklist

• A specific source of identifying variation is named (shock/threshold/instrument/manipulation)
• The binding endogeneity threat is identified and the design addresses it
• Diagnostics planned (pre-trends / bandwidth / first-stage / manipulation checks)
• Accounting constructs measured with validated, prior-literature measures
• Sample frame, screens, and data vintages specified; pipeline reproducible
• If high-risk/new-data: Registered Reports (Stage 1 protocol) considered

Anti-patterns

• Kitchen-sink OLS with controls standing in for identification.
• Endogenous regressor treated as exogenous with no strategy.
• Weak/implausible instruments failing relevance or exclusion.
• Staggered DiD with two-way FE ignoring heterogeneous-treatment-timing bias (use modern estimators).
• Event windows fished for significance; ad hoc bandwidths in RD.

Output format

【Design】archival-NE / RD / IV / event-study / experiment / analytical / field
【Identifying variation】shock / threshold / instrument / manipulation
【Binding threat】OVB / reverse causality / selection / measurement — addressed by ...
【Diagnostics planned】pre-trends / bandwidth / first-stage / balance ...
【Constructs & measures】definitions + validation
【Sample & reproducibility】frame, screens, vintages; data/code pipeline
【Next step】jar-data-analysis

Resources

• ../../resources/official-source-map.md — official JAR/Chicago Booth/Wiley URLs (accessed 2026-06-01)
• ../../resources/external_tools.md — archival data sources and identification tooling (reghdfe / csdid / rdrobust / ivreghdfe)