Hello,
I think this is easy, but I can't seem to find a good way to do this in the R
help. I have a list of sites, with multiple years of data for each site id. I
want to create a new column that gives a number describing whether it is the
1st year ("1" ) the data was collected 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: 435-755-3563
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