Monica Hernandez, Stephen Pudney, and Ruth Hancock, "The Welfare Cost of Means-Testing: Pensioner Participation in Income Support", Journal of Applied Econometrics, Vol. 22, No. 3, 2007, pp. 581-598. The dataset used in this study is subject to confidentiality conditions which prevent it being deposited in the JAE Data Archive. Applications for access to the Family Resources Survey data must be made to the UK Data Archive: http://www.data-archive.ac.uk/ Our cleaned versions of the datasets and the SAS code used for the cleaning process have also been deposited in the UK Data Archive and will be available from that source. The authors can advise in cases of difficulty. Steve Pudney Director, ESRC Research Centre on Micro-Social Change Institute for Social and Economic Research University of Essex Wivenhoe Park Colchester CO4 3SQ Tel: 01206-873789 Fax: 01206-873151 spudney [AT] essex.ac.uk