N O N L I N



                 Nonlinear Statistical Regression Analysis Program

                              Copyright (c) 1992, 1993




                                 Phillip H. Sherrod

                Member, Association of Shareware Professionals (ASP)






         Nonlin  performs  statistical  regression analysis to estimate the
         values of parameters for  linear,  multivariate,  polynomial,  and
         general  nonlinear  functions.  The regression analysis determines
         the values of the parameters which cause the function to best  fit
         the  observed  data that you provide.  You specify the form of the
         function whose  parameters  are  being  estimated  using  ordinary
         algebraic  notation.   In  addition  to  determining the parameter
         estimates, Nonlin can be directed to generate an output file  with
         predicted  values  and  residuals.   It  can  also  plot  the data
         observations and the computed  function.   Although  designed  for
         regression  analysis,  Nonlin  can  also  be used to find the root
         (zero point) or minimum absolute value of a nonlinear  expression.
         Nonlin  is  in use at many engineering and research centers around
         the world.

         SUMMARY OF MAIN FEATURES

           . Fits general equation to data values.

           . Form  of  equation  is  specified   using   normal   algebraic
             notation.

           . A  library  of  built-in  function  is  included  for  use  in
             specifying  the  equation.   The  built-in  functions  include
             trig,  exponential,  log, Bessel, elliptic integrals, and many
             others.

           . Nonlin handles multivariate  functions;  up  to  12  parameter
             values may be estimated.

           . A  "SWEEP"  command  allows you to specify a range of starting
             values  in  case  the  function  has  both  local  and  global
             minimums.

           . Student's   `t'   statistic   and  associated  probability  is
             computed for each estimated parameter  providing  an  estimate
             of the significance of the value.

           . Confidence intervals can be computed.

           . Other  statistics  are  computed including `F', coefficient of
             multiple determination, and Durbin-Watson.

           . The  data  and  fitted  equation  can  be  plotted   in   high
             resolution on the console or a HP LaserJet printer.

           . Nonlin  can  be  used  to  find  the root, or point of minimum
             absolute value, of a nonlinear function.

           . Nonlin   uses   a   state-of-the-art   "adaptive"    nonlinear
             minimization  algorithm  that  is as good, or better, than you
             are likely to  find  in  even  the  most  expensive  nonlinear
             regression packages.

         SYSTEM REQUIREMENTS

         Nonlin  will  run  on  any IBM PC compatible computer under MS-DOS
         version 3.0  or  higher.   A  minimum  of  500K  of  free  RAM  is
         necessary (less if LaserJet plotting is not performed).

         The  program  does  not need a numeric coprocessor but will use it
         if available.  A  coprocessor  is  highly  recommended  for  large
         analyses.

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         Check the box below which indicates your order type:

         	___ I wish to register Nonlin ($25).

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         Add  $5 to any amount shown above if the software is being shipped
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         In  return  for  registering,  you  will  receive  the  registered
         version  of  the  program,  a  laser-printed,  bound  copy  of the
         manual, and three  months  of  telephone  or  CompuServe  support.
         Your  registration  fee will be refunded if you find a serious bug
         that cannot be corrected.

         Distribution disk choice (check one):

               3.50" HD (1.4 MB)  ______
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               5.25" DD (360 KB)  ______

         Send this form with the amount indicated to the author:

                                 Phillip H. Sherrod
                                 4410 Gerald Place
                           Nashville, TN  37205-3806 USA

                              615-292-2881 (evenings)
                               CompuServe: 76166,2640
                        Internet: 76166.2640@compuserve.com