adjust_pretest          Calculate pretest probability change over time
calc_postest_prob       Calculate posttest probability from pretest
                        probability and test characteristics
individual_probability
                        Calculate a time series of probability for an
                        individual following exposure
posttest_series         Calculate post-test probability if testing
                        occurred on each day in a series
probability_any         Find the probability of any (at least one)
                        event happening
prop_remaining          The remaining individuals who would not be
                        expected to show symptoms yet
sens                    COVID-19 PCR sensitivity by days since exposure
unit_probability        Calculate a time series of unit-wide
                        probability following exposure
