We test the presence of a change of slope in a logistic regression model with covariate measured with errors. Under the null hypothesis of no change-point, estimation of a single intercept and slope can be carried out straightforwardly by various conditional score based methods. If the alternative hypothesis holds and indeed there exists a change-point, estimation becomes more challenging, neve...

Testing whether two parameters have the same sign is a nonstandard problem due to the non-convex shape of the parameter subspace satisfying the composite null hypothesis, which is a nonlinear inequality constraint. We describe a simple example where the ordering of likelihood ratio (LR), Wald, and Bayesian sign equality tests reverses the “usual” ordering: the Wald rejection region is a subset ...

A nonparametric mixture model approach to empirical Bayes compound decisions for the Gaussian location model is compared with a parametric empirical Bayes approach recently suggested by Martin and Walker and several recent more formal Bayes procedures. Martin and Walker (2013) have recently proposed a parametric empirical Bayes procedure for the classical Gaussian compound decision problem in w...

Does foreign direct investment (FDI) migration into Nigeria and Sierra Leone generate a climate change scare (CCS) based on the pollution haven-halo hypothesis? The quasi-experimental design study utilized data from world development indicator, 1970-2019 using nonlinear autoregressive distributed lag (NARDL) model to estimate dynamic impact of FDI CO2 emissions (a proxy for CCS). found that in ...

1 MRC Vitamin Study Research Group. Prevention of neural tube defects: results of the MRC vitamin study. Lancet 1991;338:132–7. 2 Little J, Elwood M. Geographic variation. In: Elwood JM, Little J, Elwood JH, eds. The epidemiology and control of neural tube defects. Oxford: Oxford University Press, 1992:96–145. 3 Rogers SC, Weatherall JAC. Anencephalus, spina bifida and congenital hydrocephalus....

Theoretical justifications can be easier to derive for score test-based screening compared to Wald test-based screening. The main task is to find a finite-sample bound for P{|U j (0)| ≥ γn}, which can often be done by applying Bernstein-type inequalities. In contrast, Wald testbased screening requires deriving non-asymptotic tail bounds for the marginal estimators, which can be considerably mor...

This paper considers inference on functionals of semi/nonparametric conditional moment restrictions with possibly nonsmooth generalized residuals, which include all of the (nonlinear) nonparametric instrumental variables (IV) as special cases. For these models it is often difficult to verify whether a functional is regular (i.e., root-n estimable) or irregular (i.e., slower than root-n estimabl...

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The test of independence of row and column variables in a (J×K) contingency table is a widely used statistical test in many areas of application. For complex survey samples, use of the standard Pearson chi-squared test is inappropriate due to correlation among units within the same cluster. Rao and Scott (1981, Journal of the American Statistical Association 76, 221-230) proposed an approach in...