ericredaxe
Veteran
Thanks. That seems important, since the takeaway from a midterm flip of 15 seats could be positive, when it might actually predict trouble. There are the gubernatorial shifts too, which are a separate statistic.
Here is an article with some historical stats which seem to be accurate...
Since 1946 the median midterm loss is 22 seats.
https://www.vox.com/policy-and-politics/2017/5/9/15550314/2018-elections-midterms-democrats-chances-house