Long/Short Spread

Can someone explain to me how to calculate Long/Short spread. As in, “there was a negative long/short spread in Q1”–

Is this to say if Longs went up 10%, and shorts went up 15%, there would be a negative spread of 5%? Am I thinking about this correctly?

So ideally if Longs went up 20%, and shorts went down 5%, there would be a positive 25% spread? Thanks.

I hope someone responds to this question :slight_smile: