For most articles (k = 16), we were able to obtain calculated reliability estimates (Cronbach’s α) within the sample at each time point and for each measure which is necessary to accurately correct the environmental component for measurement error. Four of these articles cited other work using the same sample and measures from which we obtained the estimates. However, some articles reported reliability as an average or range across waves (k = 4) or across traits (k = 1), only reported initial reliability (k = 1), or only reported estimates of reliability from a manual (k = 2). Although not ideal, we extracted the maximum amount of information possible and associated it with the personality information. We took the midpoint of a range as the best estimate of reliability or the average when given. Initial reliability estimates were carried forward in time to apply to later time points in which reliability information was unavailable. The average reliability for all time points and measures was .78 (SD = .10, range = .30–.94).
