In a natural, unhunted deer herd, the adult sex ratio is 1.2 adult does per adult buck (make sure NOT to include fawns in the adult doe count). However, to get to that ratio in a heavy buck-harvest environment often requires so much doe killing that hunters drive the does nocturnal which drives the bucks chasing them nocturnal as well. Personally, from a hunting standpoint, I think a ratio of 1.5 adult does per adult buck works out best. That's still enough competition to keep bucks competing against each other to make a lot of sign, and be willing to chase in daylight.
But also read Ski's post carefully. When assessing things like sex ratio, fawn recruitment rate and buck age structure, take into consideration the size of the property. As Ski pointed out, deer sexually segregate themselves for most of the year. Does and their fawns will dominate the best habitat in summer and bucks dominate the poorer habitat. This can produce summer data from a property that is heavily doe/fawn dominate or heavily buck dominant. But that won't last into the fall hunting season, the time of year when the two sexes mix fairly equally.