This tutorial provides examples on how to obtain parameter estimates and their standard errors using data from case-control studies with incident and prevalent cases. The detailed methods are discussed in ``Inference for case-control studies with incident and prevalent cases'' by Marlena Maziarz*, Yukun Liu*, Jing Qin and Ruth Pfeiffer. The manuscript and the supplement can be found on [http://arxiv.org/abs/1803.06365]. All the code and example datasets are on [https://github.com/NCI-biostats/prevalent-case-control/]. (* equal contributions)

In this tutorial we describe and show examples of R code implementing methods to use standard microbiome reference groups to simplify beta-diversity analyses and faclitate independent validation as described in ``Using standard microbiome reference groups to simplify beta-diversity analyses and facilitate independent validation'' by Marlena Maziarz, Ruth M. Pfeiffer, Yunhu Wan and Mitchell H. Gail.