* 
* NonLinear Regression.
MODEL PROGRAM A=-10 B=2 c = 60 d = 1.

compute x0 = (c-a)/(b+d).
do if (x <x0).
compute pred_ = a + b*x.
else.
compute pred_=c-d*x.
end if.

NLR y1
  /OUTFILE='F:\mspeed\LOCALS~1\Temp\spss916\SPSSFNLR.TMP'
  /PRED PRED_
  /CRITERIA SSCONVERGENCE 1E-8 PCON 1E-8 .