The World Bank, African Development Bank, and dozens others monitor the development of sub-Saharan countries constantly. I monitor James’ body height in more or less regular intervals:
GDPs are calculated in different ways – so because of the outlook, I took the data from the African Development Bank Group (received Jan 22, 2014, here). My own empirical observation provided me with growth data of James’ body height.
|Year||Δ GDP Liberia||Δ Height James|
Let’s see, how that correlates to each other and find out if James’ change in height could function as a predictor for the GDP-change in Liberia. R, my favourite statistics-tool, does it in a really fast way:
> gdpliberia = c(8.9, 7.7, 5.4) > deltajames = c(6.3, 5.9, 5.6) > cor(gdpliberia, deltajames)  0.9659277
Significantly! James’ growth rate and the GDP-growth rate of Liberia correlate in a very strong way. But caution is needed: As 2014-data for James and 2013 and 2014-data for Liberia are projected, we have to prove this theory in one year. Yet for now – remarkable.