How do I interpret this output? My understanding is t-value = Value / Std. Error. If I am correct, how can I get a t-value =-2.297 when the std. error is zero? Is it because the standard errors are less than 0.0000000? Thank you.
Change the units of buffer_400. This is almost certainly a problem of the units being too large - like measuring human height in miles. It isn't dividing 0 by 0, it's just that the values are all in the 8th or later decimal places.
So, make a new variable buff_400_100000 or something that is buffersize divided by 1,000,000.