lancegui

@lancegui source repo

22 skills
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Causal Identification 2 · lancegui
Use whenever an analysis makes or implies a CAUSAL claim — "the effect of", "X caused Y", "the policy raised", "the treatment increased", "because we did X, Y changed" — or whenever you're running difference-in-differences, event studies, instrumental variables, regression discontinuity, matching, synthetic control, or panel fixed-effects models. Forces the identification strategy and its assumptions to be stated and tested BEFORE estimating, and treats the design-specific diagnostics (parallel trends, first-stage strength, manipulation tests, balance) as mandatory — placebo and sensitivity checks are a user-approved ~3-check shortlist, not an automatic battery. Use in R, Julia, or Python even when the user just says "regress Y on X", "did it work", or "estimate the impact" — a regression coefficient is not a causal effect until the design earns it.

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Executing Analysis Plans 2 · lancegui
Use once an analysis brief or pre-analysis plan is APPROVED and it's time to actually run the analysis — build the dataset, estimate the primary specification, run the robustness suite, placebo tests, and alternative designs, then assemble the results. Drives execution through the plan step by step, validating each step (data-contracts) and stopping for the user at consequential decisions (analysis-checkpoints), and, for the INDEPENDENT pieces (robustness specs, competing designs, subsample cuts, placebo tests, multiple outcomes), offers inline vs parallel-subagent dispatch up front — the execution mode is the user's call. Use whenever the user says "ok run it", "execute the plan", "now do the analysis", "run all the specs", "do the robustness checks", or you've just gotten sign-off on a plan and need to carry it out.

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Analysis State Management 2 · lancegui bundle
Use whenever an analysis phase, decision log, artifact registry, run record, or subagent handoff needs to be created, updated, resumed, or compacted. Replaces the old habit of growing and rereading one long plan file with a small docs/analysis/ YAML index and task-specific records. Use at phase boundaries, before/after compaction, when recording approved deviations, when registering outputs, and when briefing fresh subagents from durable state.

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Economic Editor · lancegui bundle
Edit and refactor LaTeX manuscripts for economics research into polished, submission-ready prose. Use when asked to edit, review, improve, tighten, refactor, or polish academic economics writing: introductions, abstracts, empirics, results, mechanisms, figure/table notes, appendices. Optimized for applied micro (DiD, event studies, IV, RDD, staggered adoption, policy variation, administrative data, heterogeneity). Handles full manuscripts, individual sections, or single paragraphs. Triggered by: 'edit this,' 'improve my intro,' 'tighten this abstract,' 'fix the notes,' 'R&R revision,' 'referee response,' 'check my writing,' 'improve flow,' or any economics manuscript editing task.

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Figure Craft · lancegui
Use when making a FIGURE / CHART / PLOT for a paper, deck, or presentation — in ANY language (R/ggplot2, Python/matplotlib, Julia/Makie). Governs the visual style: 16.5pt text throughout (axes, legend, title), no y-label (the title carries the y-axis meaning; paper figures get no headline title), concise axis labels, clean theme with colorblind-safe Paul-Tol palette, B&W-legible (shape/linetype redundancy), and a mandatory visual self-check (no clipped text, no overlapping labels). Covers DiD/event-study plots (dots + error bars, dashed treatment line), trend lines, stacked bars, distributions, scatter — and the layout each forces. At most 1-2 inside-canvas annotations that ENHANCE understanding (absolute counts on pct bars, pretreatment-level label on DiD); metadata (N, source, p-values) goes in LaTeX notes. Output: 5×3 in, saved to results/figures/. Fires on "make a figure", "plot this", "chart", "draw", "visualize" — AFTER the data is framed and verified.

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Analysis Craft · lancegui
Use when WRITING or EDITING analysis code, notebooks, or data pipelines in R, Julia, or Python — keeping the code minimal, surgical, and legible rather than over-engineered. Use whenever you're about to add a class/framework to a one-off script, refactor a working pipeline you were only asked to tweak, build configurability nobody requested, or rewrite someone's analysis while making an unrelated change — even if the user just says "add a column", "tweak this notebook", or "clean up this script". Also use when asked to make analysis code readable, annotate it for a replication package or a referee, or document WHY a step was done (a sample restriction, a winsorize threshold, a cluster level) — keep the remaining logic legible, not golfed.

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Data Contracts · lancegui bundle
Use when computing, transforming, cleaning, joining, merging, aggregating, reshaping, or modeling ANY result from data — before you trust a number, a table, a model metric, or a chart. Establishes data contracts and invariants up front, validates assumptions before building on them, asserts join cardinality before every merge, and freezes validated results as regression baselines. Use this whenever you load a dataset, write a transform or cleaning step, do a join or group-by, fit a model, or are about to report a figure — even if the user only says "analyze this", "what's the trend", "clean this up", "merge these two files", or "build this metric" without ever mentioning tests or validation — in R, Julia, Python, or Stata. NOT the owner of the cleaning PHASE: building a dataset end-to-end is data-preparation, which calls this skill per step.

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Analysis Review · lancegui
Use when reviewing a data analysis, notebook, script, model, or result — your own before you ship it, a colleague's before it's published, or one handed to you to "check" or "sanity-check" — in R, Julia, Python, or Stata. Hunts specifically for the silent-failure classes that pass code review but produce wrong answers — unchecked joins, leakage, fished specifications, unreconciled totals, undefined metrics, identification gaps, and structural-model failures (non-identified parameters, no recovery test, counterfactuals with prices held fixed). Use when the user says "review this analysis", "can you check my notebook", "does this look right", "sanity-check these numbers", "before I send this", or is about to accept someone else's analytical result. Also use when receiving review feedback on your own analysis, to verify the critique rather than reflexively agreeing.

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Data Preparation · lancegui bundle
Use when building, cleaning, or assembling the DATASET an analysis runs on in R, Julia, or Python — the moment someone says "clean the data", "the data is messy", "build/assemble the panel", "construct the dataset", "merge these files into one dataset", "prep the data", "dedupe these records", "reconcile the totals", or "recode these variables". Owns the data-ingest-and-cleaning PHASE — decomposing raw sources → clean → join → dedup → recode → reconcile into a phased checklist and decisions ledger under docs/analysis/ so every consequential cleaning choice is recorded with WHY and auditable. Anchored to a dataset/panel/table being built from real sources; it is NOT for tidying a code repository, renaming files, or "cleaning up" a script. Triggers when cleaning is more than a couple of steps or will span a session; a single already-clean file is waived.

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Question Framing · lancegui
Use BEFORE starting any data analysis, metric, model, causal study, or any deliverable built FROM data — "what's the trend", "is X driving Y", "how many users", "did the policy work", "build me a dashboard metric", "plot/map/visualize this", "make a figure/chart/map/dashboard/table of …", "build an interactive map of these facilities", or a dataset handed over to "look into". Fires for figures, maps, charts, dashboards, and summary tables built from a dataset, not only metrics — the from-data anchor separates it from generic app/UI building. For general/exploratory work it is the everyday analysis-state skill: data sources, approach, and deliverable fixed in docs/analysis/ before execution. Use even when the request feels clear — vague definitions ("active users", "the effect of X") and unspecified joins are the root cause of artifacts that answer the wrong question precisely or silently mis-join. Not for polishing prose or UI work with no dataset behind it.

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Pre Analysis Plan · lancegui
Use BEFORE running a confirmatory analysis, an experiment readout, an A/B test, a policy evaluation, or any study whose credibility depends on not having fished for the result — especially causal/econometric work. Locks the hypotheses, estimand, primary specification, sample and exclusions, and the robustness suite while the outcomes are still unseen, so the analysis is confirmatory rather than a specification search. Use whenever the user says "evaluate whether X worked", "test this hypothesis", "did the experiment move the metric" (outcomes still unseen — already-unblinded results route to causal-identification and analysis-review), "register this analysis", or is about to estimate an effect they have a stake in — and use it to clearly separate pre-registered confirmatory claims from exploratory findings.

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Predictive Modeling · lancegui bundle
Use whenever the GOAL is a prediction that drives an action — predict, score, rank, flag, classify, forecast, or detect anomalies on units ("which pharmacy is likely diverting opioids", "which claim to audit", "who's likely to churn", "rank by risk"). Route by GOAL, not algorithm: a prediction deliverable is this skill even when a random forest does the work; a causal effect stays in causal-identification even when ML does the heavy lifting (double/debiased ML, causal forests, ML propensity scores). Covers clean-label, proxy/weak-label, unsupervised/anomaly (no label), and ranking/triage regimes in R, Julia, or Python. A high validation score is not a working model until leakage is ruled out and the split mirrors deployment. NOT for one-off data-QA outlier checks while cleaning a dataset — that's data-contracts; uplift/CATE-for-targeting runs BOTH this skill's evaluation gates and causal-identification's design.

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Result Verification · lancegui
Use ONLY when the user directly asks to verify, check, reconcile, or reproduce a result ("verify this", "check these numbers", "does this tie out?", "is this right?", "reproduce it from a clean kernel", "confirm the figures match the text") — never auto-fire it before reporting, shipping, or calling an analysis done. Reconciles totals to source, reproduces the result from a clean session with a fixed seed, confirms the user-approved robustness ran (never initiating new checks itself), and confirms every figure and table matches the numbers in the prose — evidence before assertion. In R, Julia, Python, or Stata. When a result is about to ship unverified, OFFER it in one line; the user decides. NOT the adversarial pre-ship review — that's analysis-review, which follows once these checks pass.

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Using Causal Powers · lancegui bundle
Use when starting any data analysis, econometrics, or causal-inference task in R, Julia, or Python — establishes the Causal Powers discipline and routes to the right skill (question-framing, descriptive-evidence, pre-analysis-plan, analysis-state-management, data-contracts, data-preparation, analysis-craft, figure-craft, analysis-checkpoints, executing-analysis-plans, wrong-number-debugging, result-verification, causal-identification, structural-estimation, predictive-modeling, analysis-review, project-organization). Invoke this whenever someone asks you to analyze data, compute a metric, clean or merge datasets, fit a model, estimate an effect, simulate a counterfactual, check a number, or **build a deliverable from data — a figure, chart, dashboard, or visualization** — even if they only say "analyze this", "what's the trend", or "plot this" — so the right discipline skill fires before you touch the data.

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Analysis Checkpoints · lancegui
Use throughout the EXECUTION of any analysis — while running, debugging, modeling, or cleaning data — to decide which decisions you may make on your own and which you must STOP and bring to the user first. Forces a human-in-the-loop checkpoint before any consequential analytical choice — changing the research design, estimand, or identification strategy; deviating from the framed question or pre-analysis plan; dropping/filtering/winsorizing data or changing the sample; choosing between materially different specifications; redefining a metric; or changing any number the user has already seen. Use this whenever you catch yourself about to "just fix it", "upgrade the design", "drop the outliers", or otherwise decide something on the user's behalf — especially mid-debugging, where design changes get smuggled in as bug fixes.

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Descriptive Evidence · lancegui bundle
Use when the deliverable is a DESCRIPTION of what's in the data rather than an effect, a counterfactual, or a prediction — stylized facts, trends ("what's the trend in X", "how has Y changed over time", "plot the growth"), summary-statistics/Table-1 tables, distributions, descriptive maps/choropleths ("map where X is concentrated"), and the motivating-facts section of an empirical paper. The descriptive layer BENEATH the modeling fork: often the whole deliverable; otherwise the stylized fact motivates the causal/structural/predictive question. Use in R, Julia, or Python whenever someone says "what's the trend", "show me the growth", "summary stats", "Table 1", "describe this data", "stylized facts", "what does the distribution look like", or "give me some motivating facts" — even for a quick plot or map, because a mis-deflated, mis-weighted, composition-driven, or count-not-rate "fact" looks exactly as clean as a real one. Co-fires with question-framing.

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Project Organization · lancegui
Use when finishing a piece of analysis and about to commit or push, when a directory has accreted files and it's unclear what is a deliverable versus scratch, when setting up or reorganizing a research repository, or when asked to clean up the directory, organize the repo, standardize naming, or make a project reproducible. Also fires throughout the work — when creating a new script, dataset, table, or figure, place and name it per the project's structure; and at phase boundaries (plan agreed, clean dataset built, result validated) commit a local checkpoint. For empirical and structural economics research projects in R, Julia, Python, and Stata, organized around the paper they produce. Triggers on "clean up the repo", "organize the project", "what should the folder structure be", "before I push this", "standardize the naming", "make this reproducible for a collaborator", "commit a checkpoint", or "I haven't committed in a while".

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Causal Identification · lancegui
Use whenever an analysis makes or implies a CAUSAL claim — "the effect of", "X caused Y", "the policy raised", "the treatment increased", "because we did X, Y changed" — or whenever you're running difference-in-differences, event studies, instrumental variables, regression discontinuity, matching, synthetic control, or panel fixed-effects models. Forces the identification strategy and its assumptions to be stated and tested BEFORE estimating, and treats the design-specific diagnostics (parallel trends, first-stage strength, manipulation tests, balance) as mandatory — placebo and sensitivity checks are a user-approved ~3-check shortlist, not an automatic battery. Use in R, Julia, or Python even when the user just says "regress Y on X", "did it work", or "estimate the impact" — a regression coefficient is not a causal effect until the design earns it.

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Structural Estimation · lancegui bundle
Use whenever an analysis estimates the PRIMITIVES of an economic model — preferences/utility, costs, information/consideration, search, or conduct — or needs a COUNTERFACTUAL the data doesn't contain (a merger, a new product, a tax, a removed friction, welfare/surplus, equilibrium re-pricing). Fires for structural demand estimation (logit, random-coefficients/BLP), supply-side markup-and-cost recovery, dynamic discrete choice (Rust/CCP), entry and dynamic games, auctions, limited consideration sets, and search models — GMM/method of (simulated) moments, NLS, or maximum (simulated) likelihood. Use in R, Julia, or Python even when the user just says "estimate a demand model", "simulate the merger", "recover marginal costs", "what's the welfare effect", or "fit a structural model" — a converged optimizer is not an identified model, and a clean estimation run says nothing about whether the counterfactuals are right.

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Wrong Number Debugging · lancegui
Use the moment a computed result looks wrong, surprising, suspicious, or "off" — a total that doesn't reconcile, revenue that tripled after a join, a mean that moved, a coefficient with the wrong sign, a count that's too high or too low, a metric that disagrees with another team's. Bisects the data pipeline to find the exact step where the number went bad, tracing provenance backward instead of guessing-and-patching. Use whenever the user says "this number looks wrong", "why is this so high", "these don't match", "the totals are off", "that can't be right", or when a `data-contracts` reconciliation fails — in R, Julia, Python, or Stata.

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Executing Analysis Plans · lancegui
Use once an analysis brief or pre-analysis plan is APPROVED and it's time to actually run the analysis — build the dataset, estimate the primary specification, run the robustness suite, placebo tests, and alternative designs, then assemble the results. Drives execution through the plan step by step, validating each step (data-contracts) and stopping for the user at consequential decisions (analysis-checkpoints), and, for the INDEPENDENT pieces (robustness specs, competing designs, subsample cuts, placebo tests, multiple outcomes), offers inline vs parallel-subagent dispatch up front — the execution mode is the user's call. Use whenever the user says "ok run it", "execute the plan", "now do the analysis", "run all the specs", "do the robustness checks", or you've just gotten sign-off on a plan and need to carry it out.

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Analysis State Management · lancegui bundle
Use whenever an analysis phase, decision log, artifact registry, run record, or subagent handoff needs to be created, updated, resumed, or compacted. Replaces the old habit of growing and rereading one long plan file with a small docs/analysis/ YAML index and task-specific records. Use at phase boundaries, before/after compaction, when recording approved deviations, when registering outputs, and when briefing fresh subagents from durable state.

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22 published skills