C. Koen et F. Lombard, THE ANALYSIS OF INDEXED ASTRONOMICAL TIME-SERIES .3. INTRINSIC PERIODSCATTER, Monthly Notices of the Royal Astronomical Society, 274(3), 1995, pp. 821-831
Three tests for the presence of intrinsic scatter (as distinct from ex
trinsic measurement error) in the periods of long-period pulsating sta
rs are described. Real and simulated data are analysed for illustrativ
e purposes. Modifications demanded by the possibility of trends in the
underlying mean period are given. A method for establishing the detai
led properties of the intrinsic period scatter is discussed. The wider
applicability of some of the techniques is demonstrated by an analysi
s of short-period variable star data.