This paper develops a uniform test of linearity against thresholds effects in the quantile regression framework. The test is based on the supremum of the Wald process over the space of quantile and threshold parameters. We establish the asymptotic null distribution of the test statistic for stationary weakly dependent processes, and propose a simulation method to approximate the critical values...

This work focuses on developing and characterizing a statistic for testing contrasts among population effects and developing confidence regions for those effects using data from longitudinal studies. Historically, likelihood ratio or Wald-type statistics were used for such analyses, but those statistics produce very optimistic Type I error rates. McCarroll and Helms (1987) introduced an ad hoc ...

We propose an approximate maximum likelihood parameter estimation algorithm, combined with a model order estimator, for superimposed undamped exponentials in noise. The algorithm combines the robustness of Fourier-based estimators and the high-resolution capabilities of parametric methods. We use a combination of a Wald statistic and a MAP test for order selection and initialize an iterative ma...

Background Infertility is the inability to conceive children after one year of unprotected intercourse. The estimated prevalence of infertility in Canada is 11.5-15.7%. Fertility problems affect approximately one in seven couples in the United Kingdom (UK). Infertility occurs in conditions in which the pregnancies end with recurrent miscarriages (ASR) or birth of a child with multiple congenita...

INTRODUCTION The pattern of exhaled breath volatile organic compounds represents a metabolic biosignature with the potential to identify and characterize lung cancer. Breath biosignature-based classification of homogeneous subgroups of lung cancer may be more accurate than a global breath signature. Combining breath biosignatures with clinical risk factors may improve the accuracy of the signat...

In a previous study (1998), how to evaluate whether adaptive testing data used for online calibration sufficiently fit the item response model used by C. Glas was studied. Three approaches were suggested, based on a Lagrange multiplier (LM) statistic, a Wald statistic, and a cumulative sum (CUMSUM) statistic respectively. For all these methods, the asymptotic variance of the parameter estimates...