If you are writing up a paper that uses a complex regression model (complex meaning multiple independent variables), you need to document information that allows the reader to assess the quality of the predictions that your model would produce. This paper provides a checklist of things that you need to document in such a paper, and is an extension of the CONSORT guidelines to this particular type of research.
Collins GS, Reitsma JB, Altman DG, Moons KG. Transparent reporting of a multivariable prediction model for individual prognosis or diagnosis (TRIPOD): the TRIPOD Statement. BMC Medicine. 2015;13(1):1. doi:10.1186/s12916-014-0241-z. Available in html format.
You can find an earlier version of this page on my blog.