The same rate-of-profit calculation as the world tool, but from a different data source entirely: OECD's STAN database instead of the Penn World Table. STAN is actively updated (its companion ICIO/TiVA tables now run to 2022, with a new edition roughly every two years) and its industry-level detail is a path to questions PWT's whole-economy aggregates can't touch, like productive-sector profit rates -- not built here yet, but the door PWT doesn't have.
r = s / (C + v) · s = gross operating surplus + mixed income (B2A3G) · v = compensation of employees (D1) · C = net capital stock, current replacement cost (N11NA)
Why a second source matters: every number on the other pages ultimately traces back to one data family (PWT) or one country's statistical agency (BEA). An academic comparison of WIOD against this same OECD system found their value-added estimates disagree by a mean of ~45% at the country level, even over the same years — different institutions building input-output data from similar raw material still diverge substantially. Whatever this page's rate of profit does or doesn't have in common with the PWT-based one is exactly that kind of independent check, not a rounding difference.
No claim of Roberts's in this project's indexed corpus (1,600+ posts checked) uses OECD/STAN or TiVA data — everything he cites is PWT, AMECO, EPWT, BEA, or WIOD. This page extends what this project can compute; it isn't verifying something he's already published.