Murphy, G.H. and Goodall, E. (1980) Measurement error in direct observations: a comparison of common recording methods. Behaviour Research and Therapy, 18 (2). pp. 147-150. ISSN 0005-7967.
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Abstract Videotapes of three brief duration, three medium duration and three long duration types of stereotyped behaviour (of eight severely retarded children) were analysed to provide a criterion record of the true percentage duration of the behaviour. The criterion record was compared with the records produced by four time-sampling methods: a whole-interval method, two partial-interval methods and a momentary time-sampling method. As predicted, the whole-interval method grossly underestimated and the partial-interval methods grossly overestimated the true percentage duration of the behaviour, except when the duration of individual responses was much longer than the observation interval. Momentary time-sampling was not an errorless method but was consistently superior to the other methods. The implications of these findings for the detection of treatment effects by direct observations are discussed.
|Subjects:||H Social Sciences > HV Social pathology. Social and public welfare > HV1568 Disability studies|
|Divisions:||Faculties > Social Sciences > School of Social Policy Sociology and Social Research > Tizard|
|Depositing User:||Jo Ruffels|
|Date Deposited:||07 Nov 2012 10:32|
|Last Modified:||22 Mar 2013 15:17|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/32113 (The current URI for this page, for reference purposes)|
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