Here is a brief description of my problem:
I put all the following code into nlexample.do
~~~~~~~~~~~~~~~~
clear
set obs 100
gen x=uniform()
gen y=3 +.75/(1+exp(-2*x-0.1))
capture program drop nlexample
program nlexample
version 8
if "`1'" == "?"{ // alt+0145 1 alt+0146 <=> for
`1'
global S_1 "b c k A"
global k = 1
global A = 1
global b = 1
global c = 1
exit
}
replace `1'=$b +$c/(1+exp(-$A*x-$k)) // alt+0145 1 alt+0146 <=>
for `1'
end
nl example y
~~~~~~~~~~~~~~~~~~~~~~~
at last I give :do nlexample: in command line- and I always get the
error-message
::: invalid name - and I don't know why,
my ambition is to make nonlinear-fit for z(d) = a1*exp(-((d-a2)/a3)^2) +
a4*exp(-((d-a5)/a6)^2)
with LevenbergMarquardt therefore I need this example above.
Thank you for any help. andreas
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