Exact inference for growth curves with intraclass correlation structure

We consider repeated observations taken over time for each of several subje cts. For example, one might consider the growth curve of a cohort of babies over time. We assume a simple linear growth curve model. Exact results bas ed on sufficient statistics (exact tests of the null hypothesis that a coef ficient is zero, or exact confidence intervals for coefficients) are not av ailable to make inference on regression coefficients when an intraclass cor relation structure is assumed. This paper will demonstrate that such exact inference is possible using generalized inference.