I have the following data:
Goal Achieved 100 90 150 130 200 175 ...
The first column "Goal" is the number which should be done that day, and the column "Achieved" is the number that was actually done that day. Each row stands for a day.
I want to use this data to assess the performance of a worker. Here below I have two ideas:
Which one of the methods is reasonable and mathematically right?
Or if neither is good, what should I do to evaluate the performance of a worker?