I do this all the time to gauge how I'm running which at the moment is horrifically bad.
I usually work with five columns. First column is when I get lucky, Second is for races(check for a win and x for a loss), Third is for bad beats, fourth is for dumb plays I make, Fifth is for well played hands like good folds or reads, etc.
Currently I have lots of x's in my second column and a bunch of checks in my third and fourth columns. In other words I'm going through one of those bad stretches where I can't win races, I'm losing when ahead and I'm punished for all my stupid plays.
I always found my system helps me get out of funks better by keeping me on even keel and forcing to cut down on mistakes and tighten up.