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+NIST/ITL StRD
+Dataset Name:  Thurber           (Thurber.dat)
+
+File Format:   ASCII
+               Starting Values   (lines 41 to 47)
+               Certified Values  (lines 41 to 52)
+               Data              (lines 61 to 97)
+
+Procedure:     Nonlinear Least Squares Regression
+
+Description:   These data are the result of a NIST study involving
+               semiconductor electron mobility.  The response 
+               variable is a measure of electron mobility, and the 
+               predictor variable is the natural log of the density.
+
+
+Reference:     Thurber, R., NIST (197?).  
+               Semiconductor electron mobility modeling.
+
+
+
+
+
+
+Data:          1 Response Variable  (y = electron mobility)
+               1 Predictor Variable (x = log[density])
+               37 Observations
+               Higher Level of Difficulty
+               Observed Data
+
+Model:         Rational Class (cubic/cubic)
+               7 Parameters (b1 to b7)
+
+               y = (b1 + b2*x + b3*x**2 + b4*x**3) / 
+                   (1 + b5*x + b6*x**2 + b7*x**3)  +  e
+
+
+          Starting Values                  Certified Values
+
+        Start 1     Start 2           Parameter     Standard Deviation
+  b1 =   1000        1300          1.2881396800E+03  4.6647963344E+00
+  b2 =   1000        1500          1.4910792535E+03  3.9571156086E+01
+  b3 =    400         500          5.8323836877E+02  2.8698696102E+01
+  b4 =     40          75          7.5416644291E+01  5.5675370270E+00
+  b5 =      0.7         1          9.6629502864E-01  3.1333340687E-02
+  b6 =      0.3         0.4        3.9797285797E-01  1.4984928198E-02
+  b7 =      0.03        0.05       4.9727297349E-02  6.5842344623E-03
+
+Residual Sum of Squares:                    5.6427082397E+03
+Residual Standard Deviation:                1.3714600784E+01
+Degrees of Freedom:                                30
+Number of Observations:                            37
+
+
+
+
+
+
+
+Data:   y             x
+      80.574E0      -3.067E0
+      84.248E0      -2.981E0
+      87.264E0      -2.921E0
+      87.195E0      -2.912E0
+      89.076E0      -2.840E0
+      89.608E0      -2.797E0
+      89.868E0      -2.702E0
+      90.101E0      -2.699E0
+      92.405E0      -2.633E0
+      95.854E0      -2.481E0
+     100.696E0      -2.363E0
+     101.060E0      -2.322E0
+     401.672E0      -1.501E0
+     390.724E0      -1.460E0
+     567.534E0      -1.274E0
+     635.316E0      -1.212E0
+     733.054E0      -1.100E0
+     759.087E0      -1.046E0
+     894.206E0      -0.915E0
+     990.785E0      -0.714E0
+    1090.109E0      -0.566E0
+    1080.914E0      -0.545E0
+    1122.643E0      -0.400E0
+    1178.351E0      -0.309E0
+    1260.531E0      -0.109E0
+    1273.514E0      -0.103E0
+    1288.339E0       0.010E0
+    1327.543E0       0.119E0
+    1353.863E0       0.377E0
+    1414.509E0       0.790E0
+    1425.208E0       0.963E0
+    1421.384E0       1.006E0
+    1442.962E0       1.115E0
+    1464.350E0       1.572E0
+    1468.705E0       1.841E0
+    1447.894E0       2.047E0
+    1457.628E0       2.200E0