jfqa-identification-strategy

JFQA Identification Strategy (jfqa-identification-strategy)

Use this skill to make the research design defensible for JFQA, an empirical and quantitative finance journal. JFQA referees press hard on whether a correlation is causal (or, in asset pricing, whether a premium is robust and not data-mined).

Empirical finance designs (the common case)

Pick the design that matches the question and defend it:

• Cross-section of returns — portfolio sorts and Fama-MacBeth regressions; Newey-West / clustered SEs; control for standard factors; report economic magnitudes (return per one-SD change), not only t-stats; guard against data snooping (out-of-sample, multiple-testing awareness).
• Corporate finance panels — firm and time fixed effects, two-way clustering; show the variation that identifies the coefficient.
• Policy / regulatory shocks — staggered DID with a modern estimator (Callaway-Sant'Anna, de Chaisemartin-D'Haultfœuille), event-study leads/lags, and parallel-trends evidence; avoid naive TWFE on staggered timing.
• Natural experiments / IV — instrument relevance (first-stage F), exclusion logic backed by an economic story, weak-IV-robust CIs.
• Thresholds / index reconstitution — RDD with manipulation/density tests and bandwidth robustness.
• Announcements — event study with CARs/BHARs, a defensible market model, and attention to calendar clustering.

What referees demand

• The right standard errors (clustering dimension justified, two-way where needed).
• Economic significance reported alongside statistical significance.
• Endogeneity confronted explicitly, not waved away with "controls."

Theoretical submissions

JFQA also publishes theory. If your paper is a model, pivot this skill to: stating assumptions transparently, deriving results/propositions, clean proof exposition, and testable implications a finance reader can take to data. Keep generality matched to the question.

Threat-to-remedy matrix for the JFQA referee report

Endogeneity threat	How it surfaces in the draft	JFQA-grade remedy
Reverse causality	outcome plausibly drives the regressor	timing structure, a shock that moves only the regressor, or an IV with an economic exclusion story
Omitted firm-level variation	"we control for size and B/M"	firm FE plus a within-firm variation count showing the coefficient is still identified
Selection into treatment	treated and control firms differ pre-event	matching or entropy balancing plus pre-trend evidence, not either alone
Anticipation of regulation	effects appear before adoption	shift the event date, drop the anticipation window, show announcement-date returns
Data-mined anomaly	one sort, one sample, large t-stat	sub-period splits, out-of-sample evidence, multiple-testing discussion
Bad controls	post-treatment variables on the RHS	re-specify; report with and without, and explain which is the estimand

Worked vignette: staggered adoption done the JFQA way (illustrative)

Suppose 23 states adopt a disclosure rule between 2008 and 2016 and the outcome is the credit spread of in-state issuers. A naive TWFE regression gives -4.1%; the Callaway-Sant'Anna group-time ATT gives -2.6% because late-vs-already-treated comparisons inflated the TWFE number. The JFQA presentation: CS estimator as the headline, TWFE relegated to the appendix with the discrepancy explained, an event-study figure whose lead coefficients are jointly insignificant (p = 0.42), and — with only 23 clusters — wild cluster bootstrap inference (p = 0.03) instead of leaning on asymptotics. That package answers the three referee questions (estimator, pre-trends, inference) before they are asked.

The anomaly-credibility bar in asset pricing

• Acknowledge the multiple-testing problem head-on: the post-2016 factor-zoo literature argues for materially higher t-hurdles for new predictors; state how many specifications were examined.
• Show tradability: turnover, transaction-cost drag, and whether the premium survives value-weighting and the exclusion of microcaps.
• Run spanning tests against the standard factor models in current use; a new "factor" that the existing ones price is a robustness row, not a contribution.

Output format

【Design】sorts/FMB / panel FE / staggered DID / IV / RDD / event study / theory
【Identifying variation】what makes it credible
【Inference】clustering / weak-IV / multiple-testing handling
【Economic magnitude】effect size in finance units
【Next step】jfqa-data-analysis