GRAPH /HISTOGRAM=dZY . *Linear regression. REGRESSION /MISSING LISTWISE /STATISTICS COEFF OUTS R ANOVA /CRITERIA=PIN(.05) POUT(.10) /NOORIGIN /DEPENDENT dZY /METHOD=ENTER Alpha. *Flags 1. SORT CASES BY Beta . SPLIT FILE SEPARATE BY Beta . GRAPH /HISTOGRAM=dZY . SPLIT FILE OFF. *Flags 2. GRAPH /SCATTERPLOT(BIVAR)=dZY WITH Alpha /MISSING=LISTWISE . *Cusp with nonlinear regression. MODEL PROGRAM Intercept=0.01 B1=0.01 B2=0.01 B3=0.01 B4=0.01 . COMPUTE PRED_ = Intercept + B1 * Beta * ZY1 + B2 * Alpha + B3 * ZY1 ** 2 + B4 * ZY1 ** 3. NLR dZY /PRED PRED_ /CRITERIA SSCONVERGENCE 1E-8 PCON 1E-8 . *Cusp with linear regression. COMPUTE BetaZY1 = Beta*ZY1 . COMPUTE ZY1_2 = ZY1 ** 2 . COMPUTE ZY1_3 = ZY1 ** 3 . EXECUTE . REGRESSION /MISSING LISTWISE /STATISTICS COEFF OUTS R ANOVA /CRITERIA=PIN(.05) POUT(.10) /NOORIGIN /DEPENDENT dZY /METHOD=ENTER Alpha BetaZY1 ZY1_2 ZY1_3 . *3-D scatter. IGRAPH /VIEWNAME='Scatterplot' /X1 = VAR(Beta) TYPE = SCALE /Y = VAR(dZY) TYPE = SCALE /X2 = VAR(Alpha) TYPE = SCALE /COORDINATE = THREE /FITLINE METHOD = LLR NORMAL BANDWIDTH = FAST X1MULTIPLIER = 1.00 X2MULTIPLIER = 1.00 LINE = TOTAL SPIKE=OFF /X1LENGTH=3.0 /YLENGTH=3.0 /X2LENGTH=3.0 /CHARTLOOK='D:\Program Files\SPSS\Looks\dots.clo' /SCATTER COINCIDENT = NONE. EXE.