t-stat in parenthesis

[yonxie]

I noticed you use standard error in the parenthesis below regression coeffcients. But many researchers use t-statistic which directly refect the significance of the coefficients. I find it doesn't request much work to add such flexibility. It would be great if you have it.

[toobaz]

You are right, this would be a nice addition (I actually thought it was supported already!)

A PR will be welcome.

[vlshields]

I have created a PR for this issue