What should be size of data for SISO system identification with sustem identification toolbox

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Shafaq Gul
Shafaq Gul 2021-7-9
Greeting!
Can some one please guide that how much data is enough to identify a model in system identification toolbox. Is there any rule of thumb.
I have alot data for a SISO system ; multisine inputs is used with one period 4000 samples and total are 50000 samples. I observed that different size data gives different results for the specific model characteristics.

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