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...llected for the site, the second year ("2"), etc. I have different years for each siteid, but I don't care which year it was collected, just the order that it is in for that siteid. This is what I have so far, but it doesn't do the analysis separately for each SiteID. indexi<-indexg[order(indexg$SiteID,indexg$Yr),] obs=0 indexi=na.omit(indexi) for(i in 1:length(indexi$SiteID)){ obs=obs+1 indexi$obs[i]=obs } Thanks for any help you can give. Christy Meredith USDA Forest Service Rocky Mountain Research Station PIBO Monitoring Data Analyst Voice: 435-755-3573 Fax: 435-755-356...