How could I find significant coefficients?

Say I did hundreds of regressions based on grouped data from one table, and then got 100 rows of Coefficients C = (alpha0; alpha1; alpha2). I need to know the percentage of significant ones for those three coefficients. And R-squared for each row! Thank you very much!

[Walter Roberson]

How do you know which ones are significant?

[Iris Li]

Use T test?

[Walter Roberson]

All ttest tells you is the probability that the data is normal distribution with mean 0 standard deviation 1.

[Iris Li]

calculate t-statistic and p-value, and then set a confident interval？

[Iris Li]

And the regression is nonlinear, a quadratic function. Could you help with that? ^^

[Walter Roberson]

https://www.mathworks.com/help/stats/f-statistic-and-t-statistic.html

[Iris Li]

Umm I saw this one but I calculated the coefficients by minimizing volume-weighted mean squared error. So I kinda need to calculate the t statistics manually. Is there such a command?

[Walter Roberson]

I am not familiar enough with statistics to know that.

https://www.mathworks.com/help/stats/tcdf.html

[Iris Li]

Thank you anyway!!