The numbers support this: on average, 32% of the population is neutral towards a newly elected president. After 200 days, this has gone down to 19%. The same numbers for approval ratings remain steady: from 64% to 63%, while those for disapproval necessarily go up: from 4% to 18%.

This means that even the people who voted against the winning candidate (always between 40% and 60% of the turnout[0]) are initially mostly neutral towards them. But while the people who voted for him stay loyal for a bit (possible because they don't want to feel they've been deceived), the people who voted against him have no qualms about voicing their disapproval.

I have to admit that this "let's wait and see" attitude was pretty surprising to me. It seems like people refrain from judging a president until after he has actually made policy, as opposed to immediately upon taking office, as I would have expected them to do.

But to answer your question, I'd imagine that a plot of unemployment rate vs. approval rating would be quite enlightening.