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The Stata Journal
Volume 11 Number 1: pp. 1-29

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A procedure to tabulate and plot results after flexible modeling of a quantitative covariate

Nicola Orsini
Division of Nutritional Epidemiology
National Institute of Environmental Medicine
Karolinska Institutet
Stockholm, Sweden
Sander Greenland
Departments of Epidemiology and Statistics
University of California–Los Angeles
Los Angeles, CA
Abstract.  The use of flexible models for the relationship between a quantitative covariate and the response variable can be limited by the difficulty in interpreting the regression coefficients. In this article, we present a new postestimation command, xblc, that facilitates tabular and graphical presentation of these relationships. Cubic splines are given special emphasis. We illustrate the command through several worked examples using data from a large study of Swedish men on the relation between physical activity and the occurrence of lower urinary tract symptoms.
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