Little is known about how aortic waveform parameters vary with ethnicity and lifestyle factors. We investigated these issues in a large, population-based sample.

When the observations on a bivariate Poisson population are classified as either no occurrence or at least one occurrence, the resulting sample is in the form of a 2 × 2 table. In this case, the ...

We propose a novel statistic for conducting joint tests on all the structural parameters in instrumental variables regression. The statistic is straightforward to compute and equals a quadratic form ...

Discover how the law of large numbers explains why larger samples lead to more accurate estimates of a population's true average.