The whole concept needs work. You compare each day to the previous one, but the app doesn't know by how much. Which leads to ludicrous results when applied to r

The whole concept needs work. You compare each day to the previous one, but the app doesn't know by how much. Which leads to ludicrous results when applied to real life situations. For example you got fired, or your girlfriend left you, or your friend/relative died. What a terrible day! But then over the course of several days you slowly get over it, so your mood rises up until you reach the original level. But what does the graph show? That you're feeling much better after the traumatic event! What doesn't kill you makes you stronger, eh? The model is just plain wrong.