ft = 

     General model:
     ft(a,b,c,d,x) = a+b*sigmoidmht(x,c,d)

f = 

     General model:
     f(x) = a+b*sigmoidmht(x,c,d)
     Coefficients (with 95% confidence bounds):
       a =       -9.43  (-10.81, -8.045)
       b =       7.973  (4.969, 10.98)
       c =      -2.407  (-2.501, -2.313)
       d =          10  (1.914, 18.09)

fgof = 

  struct with fields:

           sse: 562.0486
       rsquare: 0.5229
           dfe: 82
    adjrsquare: 0.5055
          rmse: 2.6181


fout = 

  struct with fields:

           numobs: 86
         numparam: 4
        residuals: [86×1 double]
         Jacobian: [86×4 double]
         exitflag: 3
    firstorderopt: 2.7695
       iterations: 23
        funcCount: 120
     cgiterations: 0
        algorithm: 'trust-region-reflective'
         stepsize: 7.7408e-04
          message: 'Success, but fitting stopped because change in residuals less than tolerance (TolFun).'
