SUBJECT: Nonlinear regression command, standard nonlinear curve fits AUTHOR: Patrick Royston Royal Postgraduate Medical School London SUPPORT: FAX (011)-44-81-740 3119 or write. COMMENTS: Use standard in1 installation instructions. From inside Stata, on-line help is available. Type 'help nlfcns'. The nl command itself, if not already installed, will be automatically installed when you install the official CRC updates into Stata's ado directory.