Lumsden, James2011-01-092011-01-091977Lumsden, James. (1977). Person reliability. Applied Psychological Measurement, 1, 477-482. doi:10.1177/014662167700100403doi:10.1177/014662167700100403https://hdl.handle.net/11299/98569Person changes can be of three kinds: developmental trends, swells, and tremors. Person unreliability in the tremor sense (momentary fluctuations) can be estimated from person characteristic curves. Average person reliability for groups can be compared from item characteristic curves.enArticle