Blog

Writing about the work.

Notes on the analyses I run, the mistakes worth catching, and the arguments I keep having about which tool is the “real” one.

2 min read

The model that was too perfect

My regression came back with R² = 1.000. That is not a good result — it is a confession. Here is how I found the leak.

RRegressionData quality
2 min read

Your worst sales day is Tuesday. Here's what to do about it.

Weekend peaks are obvious. The money is in understanding the trough — and one engineered column is all it takes to see it.

ExcelRetailDashboards
2 min read

Excel is not a lesser tool

There's a snobbery in analytics that says real work happens in Python. I've watched a well-built spreadsheet change how a business runs.

ExcelAutomationSmall business