The effect of aggregation on nonlinearity

Clive Granger and Tae Hwy Lee

Econometric Reviews, 1999, vol. 18, issue 3, 259-269

Abstract: This paper investigates the interaction between aggregation and nonlinearity through a monte carlo study. Various tests for neglected nonlinearity are used to compare the power of the tests for different nonlinear models to different levels of aggregation. Three types of aggregation, namely, cross-sectional aggregation, temporal aggregation and systematic sampling are considered. Aggregation is inclined to simplify nonlinearity. The degree to which nonlinearity is reduced depends on the importance of common factor and extent of the aggregation. The effect is larger when the size of common factor is smaller and when the extent of the aggregation is larger.

Date: 1999
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DOI: 10.1080/07474939908800445

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