Games : How to show unit count by type during game?

Is it possible to show unit count by type during a game (i.e., # of SCVs, # of marines, etc.)? I'm referring to something like the unit-count display that we can toggle when watching replays. As a new player, it would be helpful to see this (for my own units only, obviously) during game in order to help get timing of builds correct.

For example, in Age of Empires II (the last RTS game i played, LOL), it was possible to show # of villagers by type (loggers/farmers/gold miners) at any given point in a game which made it quite easy to ensure adequate macro throughout the game.