James Mitchell, Richard J. Smith and Martin R. Weale, "Efficient Aggregation of Panel Qualitative Survey Data", Journal of Applied Econometrics, Vol. 28, No. 4, 2013, pp. 580-603. The data used in this paper are the property of the Confederation of British Industry and were made available to us on a confidential (and anonymised) basis; hence the data cannot be lodged here. Please direct enquiries about the data to Jonathan Wood Centre Point 103 New Oxford Street London WC1A 1DU U.K. James Mitchell jm463 [AT] le.ac.uk