compute Dl = ln(D).
compute fHl = ln(fH).
compute D2H = D * D * H.
compute D2Hl = ln(D2H).
compute Dsq = D * D.
compute Dcu = Dsq * D.
compute Dr = 1 / D.
compute D2r = 1 / Dsq.
compute Dl2 = Dl * Dl.
compute H2 = H * H.
compute DH = D * H.
compute DH2 = D * H2.
compute D2H2 = Dsq * H2.
compute Hr = 1 / H.
compute DHr = 1 / DH.
compute D2Hr = 1 / D2H.
compute HdD = H / D.
compute HdD2 = H / Dsq.
compute Hl = ln(H).
compute Hl2 = Hl * Hl.
compute D2l = ln(Dsq).
TITLE "EQUATION 1".
REGRESSION VARIABLES = fH D Dl Dsq TO Dl2/ STATISTICS = all/
  DEPENDENT = fH/ METHOD = STEPWISE.
TITLE "EQUATION 2".
REGRESSION VARIABLES = fH D Dl D2H TO D2l/ STATISTICS = all/
  DEPENDENT = fH/ METHOD = STEPWISE.
TITLE "EQUATION 3".
REGRESSION VARIABLES = fHl D Dl D2H TO D2l/ STATISTICS = all/
  DEPENDENT = fHl/ METHOD = STEPWISE.
TITLE "EQUATION 4".
REGRESSION VARIABLES = fH D Dsq Dcu/ STATISTICS = all/ DEPENDENT = fH/
  METHOD = ENTER D Dsq Dcu.
TITLE "EQUATION 5".
REGRESSION VARIABLES = fH D Dsq/ STATISTICS = all/ DEPENDENT = fH/
  METHOD = ENTER D Dsq.
TITLE "EQUATION 6".
REGRESSION VARIABLES = fH D Dsq/ ORIGIN/ STATISTICS = all/ DEPENDENT = fH/
  METHOD = ENTER D Dsq.
TITLE "EQUATION 7".
REGRESSION VARIABLES = fH Dsq/ STATISTICS = all/ DEPENDENT = fH/
  METHOD = ENTER Dsq.
TITLE "EQUATION 8".
REGRESSION VARIABLES = fH D/ STATISTICS = all/ DEPENDENT = fH/
  METHOD = ENTER D.
TITLE "EQUATION 9".
REGRESSION VARIABLES = fH D/ ORIGIN/ STATISTICS = all/ DEPENDENT fH/
  METROD = ENTER D.
TITLE "EQUATION 10".
REGRESSION VARIABLES = fH Dr D2r/ STATISTICS = all/
  DEPENDENT = fH/ METHOD ENTER = Dr D2r.
TITLE "EQUATION 11".
REGRESSION VARIABLES = fH Dl/ STATISTICS = all/ DEPENDENT = fH/
  METHOD = ENTER Dl.
TITLE "EQUATION 12".
REGRESSION VARIABLES = fH D Dl/ STATISTICS = all/ DEPENDENT = fH/
  METHOD = ENTER D Dl.
TITLE "EQUATION 13".
REGRESSION VARIABLES = fH H H2/ STATISTICS = all/ DEPENDENT = fH/
  METHOD = ENTER H H2.
TITLE "EQUATION 14".
REGRESSION VARIABLES = fH H H2/ ORIGIN/ STATISTICS = all/ DEPENDENT = fH/
  METHOD = ENTER H H2.
TITLE "EQUATION 15".
REGRESSION VARIABLES = fH H/ STATISTICS = all/ DEPENDENT = fH/
  METHOD = ENTER H.
TITLE "EQUATION 16".
REGRESSION VARIABLES = fH H/ ORIGIN/ STATISTICS = all/ DEPENDENT = fH/
  METHOD = ENTER H.
TITLE "EQUATION 17".
REGRESSION VARIABLES = fH H Dsq/ STATISTICS = all/ DEPENDENT = fH/
  METHOD = ENTER H Dsq.
TITLE "EQUATION 18".
REGRESSION VARIABLES = fH H Dsq/ ORIGIN/ STATISTICS = all/ DEPENDENT = fH/
  METHOD = ENTER H Dsq.
TITLE "EQUATION 19".
REGRESSION VARIABLES = fHl Dl Dl2/ STATISTICS = all/
  DEPENDENT = fHl/ METHOD = ENTER Dl Dl2.
TITLE "EQUATION 20".
REGRESSION VARIABLES = fHl Dl Hl/ STATISTICS = all/ DEPENDENT = fHl/
  METHOD = ENTER Dl Hl.
TITLE "EQUATION 21".
REGRESSION VARIABLES = fHl Dl Hl/ ORIGIN/ STATISTICS = all/ DEPENDENT = fHl/
  METHOD = ENTER Dl Hl.
