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fix bootstrap sample size issue for size frequency data #734

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Merged
iantaylor-NOAA merged 1 commit into from
Sep 17, 2025
Merged

fix bootstrap sample size issue for size frequency data #734

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8 changes: 6 additions & 2 deletions SS_write_ssnew.tpl
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Original file line number Diff line number Diff line change
Expand Up @@ -1344,7 +1344,9 @@ FUNCTION void write_nudata()
for (iobs = 1; iobs <= SzFreq_totobs; iobs++)
{
f = SzFreq_obs1(iobs, 1); // sizefreq method
// maximum sample size for bootstrapping is 50000
double Nsamp_dat = 50000;
// set sample size
if (SzFreq_obs1(iobs, 7) < Nsamp_dat)
Nsamp_dat = SzFreq_obs1(iobs, 7);
SzFreq_newdat.initialize();
Expand Down Expand Up @@ -1376,10 +1378,12 @@ FUNCTION void write_nudata()
break;
}
}

// get probabilities for this observation
temp_probs3(1, SzFreq_Setup2(iobs)) = value(SzFreq_exp(iobs));
// generate a vector of multinomial random variables (bin numbers)
temp_mult.fill_multinomial(radm, temp_probs3(1, SzFreq_Setup2(iobs))); // create multinomial draws with prob = expected values
for (compindex = 1; compindex <= j; compindex++) // cumulate the multinomial draws by index in the new data
// increment the new data vector by bin number
for (compindex = 1; compindex <= Nsamp_dat; compindex++) // cumulate the multinomial draws by index in the new data
{
SzFreq_newdat(temp_mult(compindex)) += 1.0;
}
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