One of the team statics in ice-hockey is power play percentage. From example, you can see it here for the currently played World Chapmionship or here for this year's NHL season.
I understand that this should be something like ratio of power play goals and total number power plays. I wonder whether in some cases the fact that the power play is shorter than 2 minutes is factored in when calculating PP%.
There are several reasons why power play might be shorter, here are some I can think of:The power play ended because a team scored a goal. The power play was shorter because a team playing power power received a penalty. The power play was shorter because the penalty of the opposing team was called while playing shorthanded, which means that there was 4 on 4 play before the power play stared. The power play was shorter because it started less than two minutes until the end of the game.
In the first case, this was a successful power play - so there is no doubt...