background: identification of disease risk factors can help in the prevention of diseases. in assessing the predictive value of continuous variables, a routine procedure is to categorize the factors. this yield to inability to detect non‑linear relationship, if exist. multivariate fractional polynomial (mfp) modeling is a flexible method to reveal non‑linear associations. we aim to demonstrate ...

In the context of an afterschool program in which students explore relatively large authentic datasets, we investigated how 11- to 14-year old worked with categorical variables. During program, learned use Common Online Data Analysis Platform (CODAP), a statistical analysis platform specifically designed for middle and high school students, create interpret graphs. Following conducted individua...

We examined categorical effects in color appearance in two tasks, which in part differed in the extent to which color naming was explicitly required for the response. In one, we measured the effects of color differences on perceptual grouping for hues that spanned the blue-green boundary, to test whether chromatic differences across the boundary were perceptually exaggerated. This task did not ...