How can I test the significance of estimated parameters with fmincon?

Hello,

I am doing my research on a financial model called GARCH-MIDAS where the goal is to model the long-term component of stock returns volatility.

To do so, I need to estimate my model using a Maximum Likelihood procedure where I need to estimate 7 different parameters and I used fmincon command to do so.

My code is running and my results and satisfying but I need to test the significance of my estimated parameters and I don't know how to do it. When using fmincon, is there a way to compute the standard deviation of my estimated parameters or t-stats and how can we do it?

Thank you for your help and your consideration.

Best regards, Plakalo Zlatan