Herman Ole Andreas Wold (25 December 1908 – 16 February 1992) was a Norwegian-born econometrician and statistician who had a long career in Sweden.
Wold was known for his work in mathematical economics, in time series analysis, and in econometric statistics.
In mathematical statistics, Wold contributed the Cramér–Wold theorem characterizing the normal distribution and developed the Wold decomposition in time series analysis.
In microeconomics, Wold advanced utility theory and the theory of consumer demand.
In multivariate statistics, Wold contributed the methods of partial least squares (PLS) and graphical models.
Wold's work on causal inference from observational studies was decades ahead of its time, according to Judea Pearl.