Without affecting the results of the computation, the order of the nested for-statements in the procedure above can be changed such that the outer for-loop iterates over the gene list S (i = 1,…, n) and the inner for-loops over the nodes v k and the length l.
Point estimates and confidence intervals for each time point were generated based on the fitted longitudinal model, using the ESTIMATE statement in the MIXED procedure in SAS.
The supremum test was performed in SAS version 9.3 (SAS Institute, Cary, NC) using the ASSESS statement in the PHREG procedure.
Finally, least square model-adjusted means for herbivory were obtained using the ILINK option of the LSMEANS statement in the GLIMMIX procedure (SAS Institute 2005).
Proportionals hazards assumption and functional form were checked using Supremum test [ 20], which is implemented using ASSESS statement in the SAS procedure PROC PHREG.
A proportional hazards assumption was checked using the Supremum test, which was implemented using the ASSESS statement in the SAS procedure PROC PHREG (Statistical Analysis System release 9.10; SAS Institute, Cary, NC).
To aid interpretation of increases or decreases in probability of hookah use, conditional marginal effects were calculated using the LSMEANS (least squares means) statement in the PROC SURVEYLOGISTIC procedure in SAS, using the "OM" (observed margins) along with the "ILINK" (inverse link) option.
By using the variables created by the OUTROC option of the MODEL statement in the LOGISTIC procedure [ 22], the ROC curves were drawn by using Excel, and the AUCs and their standard errors were computed by using SAS codes, based on the distribution-free formulas provided by Hanley and McNeil [ 8].
Planned comparisons between treatment means were performed by use of the pdiff option in the lsmeans statement in these procedures.
The team on Tuesday announced in a statement that the procedure would actually be performed "at a future time, probably in the off season".
