Butler, R. W. and Paige, R. L. (2011). Exact distributional computations for Roy’s statistic and the largest eigenvalue of a Wishart distribution. Statistics and Computing, 21, 147-157.
Butler, R. W. and Abd-Elfattah (2011). Tests for symmetry with right censoring. Journal of Applied Statistics, 38, 683-693.
Butler, R. W., Pagie, R. L. and Chapman, P. L. (2011). Small sample LD-50 confidence intervals using saddlepoint approximations. Journal of the American Statistical Association, 106, 334-344.
Butler, R. W. and Abd-Elfattah (2009). Log-rank permutation tests for trend: Saddlepoint p-values and survival rate confidence intervals. Canadian Journal of Statistics, 17, 5-16.
Butler, R. W. , Machado, U. B. and Bychlik, I. (2009). Distribution of wave crests in non-Gaussian sea. Applied Ocean Research 31, 57-64.
Butler, R. W. and Paolella, M.S. (2008). Uniform saddlepoint approximations for ratios of quadratic forms. Bernoulli 14, 140-154.