Beginning with SAS/STAT 12.1 in SAS 9.3 TS1M2, the DSCF option in the PROC NPAR1WAY statement requests the Dwass, Steel, Critchlow-Fligner multiple comparison procedure, which is based on pairwise two-sample rankings. For more information, see "Statistical Computations: Multiple Comparisons Based on Pairwise Rankings" in the Details section of the NPAR1WAY documentation.

Prior to SAS/STAT 12.1, one approach is to rank-transform the data and use the normal-theory methods in PROC GLM (Iman, 1982). Juneau (2004) describes Dunn's procedure for pairwise comparisons in a one-way layout. He also discusses the Dwass, Steel, Critchlow-Fligner multiple comparison procedure. Macro code for Dunn's technique is available from the author. Another approach is to rank-transform the data and use the permutation resampling method in the MULTTEST procedure.

References

Iman, R.L. (1982), "Some Aspects of the Rank Transform in Analysis of Variance Problems," Proceedings of the Seventh Annual SAS Users Group International Conference, 7, 676-680.

Juneau, P. (2004), "Simultaneous Nonparametric Inference in a One-Way Layout Using the SAS System," Proceedings of the PharmaSUG 2004 Annual Conference, Paper SP04.

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