How to generate binomial data with set probability and covariation

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Johan
Johan 2014-4-15
回答： Alberto 2014-4-15
Hello Everybody,
Im having a question regarding a data simulation problem that Im having. I have neuronal network data where each neuron has a set firing probability per event (for instance p1 = 0.2 but p2 = 0.3). In addition some neurons are more likely to fire together then others so they have a set correlation or covariation. How can I generate random events where the results will (loosely) fit the previously observed propability distribution and covariation matrix?
I see that mvnrnd can generate such data with a normal distribution but I need binomial output (All-or-none firing). Does anybody know how to accomplish this? Really any suggestions will be helpfull!
Thank you in advance!

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回答（1 个）

Alberto
Alberto 2014-4-15
You can generate values uniformily on [0,1], lets suppose you want to generate 100 random binomial numbers:
N=100;
x=rand(1,N);
lets suppose your 'success' probability es p=0.7:
p=0.7;
So, your binomial sample of 1 or 0 are:
bin= x>p;
But if you are interested in multivariates samples with a given correlation, you need copulas and copularnd command.

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