https://behnamanalytics.com/writing/Healthcare BI, analytics engineering, Power BI, forecasting, and applied AI by Behnam Ebrahimi.en-gbhttps://behnamanalytics.com/writing/mcp-servers-for-data-work/https://behnamanalytics.com/writing/mcp-servers-for-data-work/Tue, 29 Sep 2026 09:00:00 +0000AI workflows & promptingWhat the Model Context Protocol is, how Claude Code connects to MCP servers, three patterns for analytics teams (read-only database access, documentation lookup and ticketing), and the governance that has to come first.https://behnamanalytics.com/writing/choosing-models-and-effort/https://behnamanalytics.com/writing/choosing-models-and-effort/Mon, 28 Sep 2026 09:00:00 +0000AI workflows & promptingHow to pick between Fable, Opus, Sonnet and Haiku and between effort levels for lookups, routine SQL, hard debugging and long builds, and how to make the choice a habit.https://behnamanalytics.com/writing/reviewing-ai-written-dax-and-sql/https://behnamanalytics.com/writing/reviewing-ai-written-dax-and-sql/Sat, 26 Sep 2026 09:00:00 +0000AI workflows & promptingA review checklist for AI-generated SQL and DAX, with wrong and right pairs for each trap and a small fixture that catches the mistakes before a stakeholder does.https://behnamanalytics.com/writing/subagents-and-parallel-work/https://behnamanalytics.com/writing/subagents-and-parallel-work/Fri, 25 Sep 2026 09:00:00 +0000AI workflows & promptingWhen to split work across Claude Code subagents, how to brief them, how to stop them racing each other, and how to check the result before anything ships.https://behnamanalytics.com/writing/prompting-for-analysts/https://behnamanalytics.com/writing/prompting-for-analysts/Thu, 24 Sep 2026 09:00:00 +0000AI workflows & promptingPrompt patterns that get usable SQL, DAX, and analysis out of a language model, the anti-patterns that waste time, and before-and-after prompts to adapt.https://behnamanalytics.com/writing/writing-claude-md-and-agents-md/https://behnamanalytics.com/writing/writing-claude-md-and-agents-md/Wed, 23 Sep 2026 09:00:00 +0000AI workflows & promptingWhat belongs in a project memory file for a coding agent, what doesn't, how Claude Code chooses between CLAUDE.md and AGENTS.md, and two worked examples.https://behnamanalytics.com/writing/claude-code-for-data-work/https://behnamanalytics.com/writing/claude-code-for-data-work/Tue, 22 Sep 2026 09:00:00 +0000AI workflows & promptingSet up the project, keep a short memory file, plan before building, fence the agent into a virtual environment and a branch, and let tests and linters decide when it's done.https://behnamanalytics.com/writing/forecast-accuracy-metrics/https://behnamanalytics.com/writing/forecast-accuracy-metrics/Mon, 21 Sep 2026 09:00:00 +0000ForecastingMAE, RMSE, MAPE, sMAPE, MASE, bias, interval coverage and pinball loss, what each one measures, where each misbehaves, and which to put in front of a planning audience.https://behnamanalytics.com/writing/explaining-models-to-stakeholders/https://behnamanalytics.com/writing/explaining-models-to-stakeholders/Fri, 18 Sep 2026 09:00:00 +0000Machine learningHow to explain a readmission risk model to clinicians and managers. Global and local explanations, permutation importance and partial dependence in scikit-learn, why correlated features mislead, what-if examples, uncertainty, and model cards.https://behnamanalytics.com/writing/data-leakage-in-healthcare-ml/https://behnamanalytics.com/writing/data-leakage-in-healthcare-ml/Thu, 17 Sep 2026 09:00:00 +0000Machine learningWhere leakage hides in health data, from post-discharge fields to time travel in lag features, how to detect it, and two worked examples from a readmission model.https://behnamanalytics.com/writing/metric-definitions-as-code/https://behnamanalytics.com/writing/metric-definitions-as-code/Wed, 16 Sep 2026 09:00:00 +0000Analytics engineeringWhy one organisation ends up with three DNA rates, what a metric definition has to pin down, and how a small YAML file compiled to SQL keeps every report on the same number.https://behnamanalytics.com/writing/dax-waiting-list-kpis/https://behnamanalytics.com/writing/dax-waiting-list-kpis/Tue, 15 Sep 2026 09:00:00 +0000Power BI, DAX & TMDLDAX patterns for referral-to-treatment reporting, including snapshot and event facts, semi-additive measures, percentage within 18 weeks, median and 92nd percentile waits, and week-on-week comparisons that stay right under any filter.https://behnamanalytics.com/writing/backtesting-forecasts-rolling-origin/https://behnamanalytics.com/writing/backtesting-forecasts-rolling-origin/Mon, 14 Sep 2026 09:00:00 +0000ForecastingWhy one train/test split misleads, how rolling-origin evaluation works, expanding versus sliding windows, horizon-aware features, a compact Python loop, and the mistakes that make backtests flatter a model.https://behnamanalytics.com/writing/claude-code-hooks-for-analytics-repos/https://behnamanalytics.com/writing/claude-code-hooks-for-analytics-repos/Fri, 11 Sep 2026 09:00:00 +0000AI workflows & promptingHow Claude Code hooks work, from events and matchers to exit codes and blocking, and five hooks for a data repository that lint Python and SQL, run fast data tests, protect generated and production files, keep secrets unread and log every command.https://behnamanalytics.com/writing/calibration-before-auc/https://behnamanalytics.com/writing/calibration-before-auc/Thu, 10 Sep 2026 09:00:00 +0000Machine learningWhy a risk score used for decisions needs probabilities that match reality, and how to check and fix calibration in scikit-learn, with numbers from a readmission model.https://behnamanalytics.com/writing/data-tests-that-catch-real-problems/https://behnamanalytics.com/writing/data-tests-that-catch-real-problems/Wed, 09 Sep 2026 09:00:00 +0000Analytics engineeringWhich data tests find the problems that reach production (grain, relationships, codes, freshness, reconciliation, drift), how to set severity, and where to put them.https://behnamanalytics.com/writing/tmdl-version-control-semantic-models/https://behnamanalytics.com/writing/tmdl-version-control-semantic-models/Tue, 08 Sep 2026 09:00:00 +0000Power BI, DAX & TMDLWhat TMDL is, how it relates to PBIP and TMSL, what tables, measures and relationships look like as text, and how to review semantic model changes in a Git pull request.https://behnamanalytics.com/writing/hierarchical-forecast-reconciliation/https://behnamanalytics.com/writing/hierarchical-forecast-reconciliation/Mon, 07 Sep 2026 09:00:00 +0000ForecastingForecasting specialty demand that has to add up to the hospital total. Why incoherent forecasts start planning arguments, what bottom-up and top-down get wrong, how MinT reconciliation works, and a backtest in Python.https://behnamanalytics.com/writing/prediction-intervals-for-planners/https://behnamanalytics.com/writing/prediction-intervals-for-planners/Thu, 03 Sep 2026 09:00:00 +0000ForecastingWhy a point forecast isn't a plan, how to build prediction intervals from backtest errors and quantile regression, how to check they hold, and how to choose and present a range for a staffing decision.https://behnamanalytics.com/writing/evaluating-llm-features-with-a-test-set/https://behnamanalytics.com/writing/evaluating-llm-features-with-a-test-set/Wed, 02 Sep 2026 09:00:00 +0000AI workflows & promptingHow to build a labelled evaluation set before shipping an LLM feature, choose metrics that match the risk, catch regressions when prompts or models change, and keep clinical text governed throughout.https://behnamanalytics.com/writing/power-bi-performance-vertipaq/https://behnamanalytics.com/writing/power-bi-performance-vertipaq/Tue, 01 Sep 2026 09:00:00 +0000Power BI, DAX & TMDLHow the VertiPaq engine stores an import model, why cardinality drives size and speed, how to split date-time columns and cut unused ones, and how to use Performance Analyzer, DAX Studio and VertiPaq Analyzer to find the real bottleneck.https://behnamanalytics.com/writing/skills-for-repeatable-analysis/https://behnamanalytics.com/writing/skills-for-repeatable-analysis/Fri, 28 Aug 2026 09:00:00 +0000AI workflows & promptingWhat a Claude Code skill is, how it loads, how to write a description that makes it trigger at the right moment, and two complete skills for analytics work, one that profiles a new table and one that reviews a DAX measure.https://behnamanalytics.com/writing/logistic-regression-vs-gradient-boosting/https://behnamanalytics.com/writing/logistic-regression-vs-gradient-boosting/Thu, 27 Aug 2026 09:00:00 +0000Machine learningA head-to-head on synthetic readmission data with scikit-learn, comparing AUROC, Brier score, calibration and stability, and a decision guide for choosing between them.https://behnamanalytics.com/writing/anomaly-detection-for-data-feeds/https://behnamanalytics.com/writing/anomaly-detection-for-data-feeds/Wed, 26 Aug 2026 09:00:00 +0000Analytics engineeringCatching a broken daily feed before the dashboard does, with day-of-week baselines, robust z-scores, STL residuals, a slow-drift check, freshness and schema checks, and thresholds that don't bury you in alerts.https://behnamanalytics.com/writing/time-intelligence-rolling-periods/https://behnamanalytics.com/writing/time-intelligence-rolling-periods/Tue, 25 Aug 2026 09:00:00 +0000Power BI, DAX & TMDLA date table that works, financial-year-to-date with an April start, rolling 12 months, same period last year, week-aligned comparisons, incomplete months, and calculation groups to stop the measure count exploding.https://behnamanalytics.com/writing/funnel-plots-for-small-numbers/https://behnamanalytics.com/writing/funnel-plots-for-small-numbers/Thu, 20 Aug 2026 09:00:00 +0000Data analysis & statisticsWhy league tables of rates put the smallest clinics and practices at both ends, and how a funnel plot with binomial control limits and an overdispersion check fixes it.https://behnamanalytics.com/writing/sql-window-functions-for-patient-pathways/https://behnamanalytics.com/writing/sql-window-functions-for-patient-pathways/Wed, 19 Aug 2026 09:00:00 +0000Analytics engineeringROW_NUMBER, RANK, LAG and window frames applied to first attendances, latest statuses, seven-day totals, continuous spells and 30-day readmissions, with real output and the mistakes that change the answer.https://behnamanalytics.com/writing/star-schema-for-healthcare-activity/https://behnamanalytics.com/writing/star-schema-for-healthcare-activity/Tue, 18 Aug 2026 09:00:00 +0000Power BI, DAX & TMDLHow I'd design a Power BI star schema for admissions, outpatients and waiting lists, from grain decisions and conformed dimensions to role-playing dates, relationship direction and semi-additive snapshots.https://behnamanalytics.com/writing/spc-charts-for-operational-metrics/https://behnamanalytics.com/writing/spc-charts-for-operational-metrics/Thu, 13 Aug 2026 09:00:00 +0000Data analysis & statisticsHow to build an XmR chart for a weekly metric, read the four special-cause rules, recalculate limits after a real change, and stop reacting to RAG noise.https://behnamanalytics.com/writing/calculate-and-filter-context/https://behnamanalytics.com/writing/calculate-and-filter-context/Tue, 11 Aug 2026 09:00:00 +0000Power BI, DAX & TMDLRow context, filter context, what CALCULATE actually does, KEEPFILTERS, REMOVEFILTERS and ALLEXCEPT, and the iterator mistakes that cost time and give wrong answers, each with a worked example.