What a job looks like has changed for many people since the recession. In general, things are looking up: Both unemployment and jobless claims are falling. But a good chunk of job creation has come at the highest and lowest ends of the spectrum, a trend that has only recently started to change with gains for middle-wage earners. Many people who lost well-paying jobs have found work, but for less money, doing hourly retail and food services jobs. These new hourly workers not only make less money, but they have much less predictable schedules than hourly workers had before the recession, according to a new study from the University of California, Davis. “The jobs replacing the ones that were lost after the recession ended were a lot of low-wage hourly jobs with really variable schedules,” said Ryan Finnigan, an assistant professor at U.C. Davis and one of the researchers who worked on the study.