Author: Maxim Pinkovskiy and Xavier Sala-i-Martin
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Staff Reports
Newer Need Not Be Better: Evaluating the Penn World Tables and the World Development Indicators Using Nighttime Lights
June 2016 Number 778
JEL classification: E01, E23, O11, O47, O57
Nighttime lights data are a measure of economic activity whose measurement error is plausibly independent of the errors of most conventional indicators. Therefore, we can use nighttime lights as an independent benchmark to assess existing measures of economic activity (Pinkovskiy and Sala-i-Martin 2016). We employ this insight to find out which vintages of the Penn World Tables (PWT) and of the World Development Indicators (WDI) better estimate true income per capita. We find that revisions of the PWT do not necessarily dominate their predecessors in terms of explaining nighttime lights (and thus, of predicting unobserved true income). In particular, we find that the PWT 7.1 chain-based GDP series substantially outperforms the constant-price series in both PWT 8.0 and PWT 8.1, the two most recent vintages of the PWT. We additionally find that the World Development Indicators are as good, and often better, measures of unobserved true income as any recent vintages of the Penn World Tables. Furthermore, we find that each new round of the International Comparisons Programme has improved the WDI’s ability to predict log unobserved true income. We also find that vintages tend to be good or bad at predicting unobserved true income roughly equally across the sample period and do not tend to be particularly good at predicting unobserved income in the year of their price survey. We conclude that GDP series based on unadjusted domestic growth rates alone predict growth rates of true income better than series based on purchasing-power-parity adjustments to growth rates.
38 pages / 533 kbTools
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