https://d3c.isr.umich.edu/software_type/r-code/https://d3c.isr.umich.edu/software_type/sas-procedure/https://d3c.isr.umich.edu/software_type/r-package/https://d3c.isr.umich.edu/software_type/web-applet/https://d3c.isr.umich.edu/software_type/example-code/https://d3c.isr.umich.edu/software_type/software-bundle-r/