compute Dsq = D * D.
compute Dcu = Dsq * D.
compute Dsr = sqrt(D).
compute Dr = 1 / D.
compute D2r = 1 / Dsq.
compute Dsrr = 1 / Dsr.
compute D1r = 1 / (D + 1).
compute D10r = 1 / (D + 10).
compute DdD = D / (D + 1).
compute Dl = ln(D).
compute D2l = ln(D * D).
compute Dl2 = Dl * Dl.
compute DdDl = ln(D / (D + 1)).
compute H1 = H - 1.3.
compute Hl = ln(H).
compute H1l = ln(H1).
compute DdH = D / H.
compute D2Hsr = sqrt(Dsq / H1).
compute D2Hs = Dsq / H1.
TITLE"EQUATION 1".
REGRESSION VARIABLES = H D Dsq TO DdDl/ STATISTICS = all/ DEPENDENT = H/
  METHOD = STEPWISE.
TITLE"EQUATION 2".
REGRESSION VARIABLES = Hl D Dsq TO DdDl/ STATISTICS = all/ DEPENDENT = Hl/
  METHOD = STEPWISE.
TITLE"EQUATION 3".
REGRESSION VARIABLES = H D Dsq Dcu/ STATISTICS = all/ DEPENDENT = H/
  METHOD = ENTER D Dsq Dcu.
TITLE"EQUATION 4".
REGRESSION VARIABLES = H1 D Dsq Dcu/ ORIGIN/ STATISTICS = all/ DEPENDENT = H1/
  METHOD = ENTER D Dsq Dcu.
TITLE"EQUATION 5".
REGRESSION VARIABLES = H D Dsq/ STATISTICS = all/ DEPENDENT = H/
  METHOD = ENTER D Dsq.
TITLE"EQUATION 6".
REGRESSION VARIABLES = H1 D Dsq/ ORIGIN/ STATISTICS = all/ DEPENDENT = H1/
  METHOD = ENTER D Dsq.
TITLE"EQUATION 7".
REGRESSION VARIABLES = H Dsq/ ORIGIN/ STATISTICS = all/ DEPENDENT = H/
  METHOD = ENTER Dsq.
TITLE"EQUATION 8".
REGRESSION VARIABLES = H D Dr/ STATISTICS = all/ DEPENDENT = H/
  METHOD = ENTER D Dr.
TITLE"EQUATION 9".
REGRESSION VARIABLES = H1 D1r D/ ORIGIN/ STATISTICS = all/ DEPENDENT = H1/
  METHOD = ENTER D D1r.
TITLE"EQUATION 10".
REGRESSION VARIABLES = H Dr D2r/ STATISTICS = all/ DEPENDENT = H/
  METHOD = ENTER Dr D2r.
TITLE"EQUATION 11".
REGRESSION VARIABLES = H Dr/ STATISTICS = all/ DEPENDENT = H/
  METHOD = ENTER Dr.
TITLE"EQUATION 12".
REGRESSION VARIABLES = H D2r/ STATISTICS = all/ DEPENDENT = H/
  METHOD = ENTER D2r.
TITLE"EQUATION 13".
REGRESSION VARIABLES = H1 D DdD/ ORIGIN/ STATISTICS = all/ DEPENDENT = H1/
  METHOD = ENTER D DdD.
TITLE"EQUATION 14".
REGRESSION VARIABLES = H D10r/ STATISTICS = all/ DEPENDENT = H/
  METHOD = ENTER D10r.
TITLE"EQUATION 15".
REGRESSION VARIABLES = H D Dl/ STATISTICS = all/ DEPENDENT = H/
  METHOD = ENTER D Dl.
TITLE"EQUATION 16".
REGRESSION VARIABLES = H Dl/ STATISTICS = all/ DEPENDENT = H/
  METHOD = ENTER Dl.
TITLE"EQUATION 17".
REGRESSION VARIABLES = DdH D Dsq/ STATISTICS = all/ DEPENDENT = DdH/
  METHOD = ENTER D Dsq.
TITLE"EQUATION 18".
REGRESSION VARIABLES = H D Dsq Dsr Dsrr Dr D2r/ STATISTICS = all/
  DEPENDENT = H/ METHOD = ENTER D Dsq Dsr Dsrr Dr D2r.
TITLE"EQUATION 19".
REGRESSION VARIABLES = D2Hsr Dsq/ STATISTICS = all/ DEPENDENT = D2Hsr/
  METHOD = ENTER Dsq.
TITLE"EQUATION 20".
REGRESSION VARIABLES = D2Hs D Dsq/ STATISTICS = all/ DEPENDENT = D2Hs/
  METHOD = ENTER D Dsq.
TITLE"EQUATION 21".
REGRESSION VARIABLES = Hl Dl/ STATISTICS = all/ DEPENDENT = Hl/
  METHOD = ENTER Dl.
TITLE"EQUATION 22".
REGRESSION VARIABLES = Hl Dr/ STATISTICS = all/ DEPENDENT = Hl/
  METHOD = ENTER Dr. 
TITLE"EQUATION 23".
REGRESSION VARIABLES = Hl DdDl/ STATISTICS = all/ DEPENDENT = Hl/
  METHOD = ENTER DdDl.
TITLE"EQUATION 24".
REGRESSION VARIABLES = H1l DdDl/ STATISTICS = all/ DEPENDENT = H1l/
  METHOD = ENTER DdDl.
TITLE"EQUATION 25".
REGRESSION VARIABLES = H1l Dr/ STATISTICS = all/ DEPENDENT = H1l/
  METHOD = ENTER Dr.
TITLE"EQUATION 26".
REGRESSION VARIABLES = Hl D Dl2/ STATISTICS = all/ DEPENDENT = Hl/
  METHOD = ENTER D Dl2.
TITLE"EQUATION 27".
REGRESSION VARIABLES = Hl Dl Dl2/ ORIGIN/ STATISTICS = all/ DEPENDENT = Hl/
  METHOD = ENTER Dl Dl2.
TITLE"EQUATION 28".
REGRESSION VARIABLES = Hl Dsr Dr D2r/ STATISTICS = all/ DEPENDENT = Hl/
  METHOD = ENTER Dsr Dr D2r.
