So, of the 50 basis points that the FOMC lowered its target for the federal funds rate last November 6, only 19 basis points were a surprise to financial markets and thus should have been expected to affect asset prices.
Note, by the way, that if the Fed had not changed interest rates at all that day, our method would have treated that action as the equivalent of a surprise tightening of policy of 31 basis points because the Fed would have done nothing while the market was expecting an easing of 31 basis points.