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Testing For The Stability And Persistence Of The Phillips Curve For Nigeria, Chuku Chuku, Johnson Atan, Felix Obioesio

CBN Journal of Applied Statistics (JAS)

In this study, we describe the problem of testing for the stability and persistence of the Phillips curve for Nigeria when there are nonstationarities in the marginal distribution of the regressors. We test for unknown break dates using the 𝑆𝑢𝑝𝐹,𝐴𝑣𝑔𝐹 and 𝐸𝑥𝑝𝐹 approaches. After reviewing the relevant asymptotic distribution theory we replicate Hansen’s fixed-regressor bootstraping scheme, which shows that Andrews’ tabulated critical values for the test statistics are oversized, and are not robust to the presence of nonstationarities in the marginal distribution of the regressors. In search of alternative bootstraping schemes, we experiment with the sieve, wild, and Rademacher schemes …