A histogram of stellar secular behavior as measured by the fractional rate of change of b + y photometric flux with time, , for a sample of 34 stars observed with Automated Photoelectric Telescopes. The subscript “15” means that was derived from a time series of 15 years duration. Also shown are commensurate histograms from the time series of the reconstruction of Shapiro and colleagues, computed as described in the text. The sloped line near x =  −4.2 shows the probability that the given value of  will be detected in the stellar sample, evaluated using the statistical properties of the photometric standard stars used.