I used to rate my happiness and productivity on 1-10 scales at the end of each day, and this was my experience too. I've since dropped that part of my diary routine, instead focusing on just writing the three best things and three things to improve/do more/do next. I still have an idea if I look back later of trends of happiness and productivity, since I can see some good things are better than others, but I don't have that feeling of disappointment in myself every time I don't make an 8+ for both.

That said, the only way I can analyze this is looking back over it, I can't input it to make informative graphs or the like.