Excess variance as a function of number of spectroscopic observations per SDSS-RM quasar. Red circles represent RM quasars with significant Hβ lag detections from Wang et al. (2020), while green triangles represent all RM quasars in our parent sample, including those without detectable lags. Both samples are based on data from the 2014 monitoring season. There is no clear distinction in either the number of observations or the excess variance between quasars with detected lags and those without.