>You just have to look. Have you done it? Can you confidently say that you can completely reproduce it? What I would like to see ideally is something like a s

>You just have to look. Have you done it? Can you confidently say that you can completely reproduce it? What I would like to see ideally is something like a spreadsheet with all formulas, coefficients, and inputs being inside it for every published CPI value. And every calculation input in the spreadsheets has to include its source. As the famous saying goes, there are 3 kinds of kinds of lies: lies, damned lies, and statistics. There is a LOT of wiggle room to play with inputs, coefficients, wights, and various adjustments.