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Parameters b, k;
Variable  t, m;
Function  ln(100/(100-m))-b*m=k*t;
data ;
5    25.33
10   46.23
20    58.72
30    67.71
40    59.75
50   75.91
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b = 0.0121073261373653
k = 0.00832784936911289
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Parameters m[-10000, 100], k;
Variable  t, m;
Function ln(100/(100-m))-bm=kt;
data ;
5    25.33
10   46.23
20    58.72
30    67.71
40    59.75
50   75.91
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