search for: sitetypes

Hello, I am trying to create a function that will move through each record of a data frame, find the value in the "HUC" column, then randomly select another observation from the dataframe with the same value in "HUC" column, as well as the same value in "Yr" column as the first observation. I want the function to produce a list of the RchID of the first observation,

...) on both sampling times (1-2),# I figure that 'replicate' should be treated as nested within 'site' and that both should be treated as random factors? # First question: Is there is difference in abundance between sites?# Second question: Is there is difference in abundance between sitetypes (blue or yellow)? #If my 'initial remarks' statement is correct (please tell me if not), then I think a generalized linear mixed model is appropriate and would be something along these lines: # Fitting the model: require(lme4) glmm1=glmer(abundance~time+sitetype+(1|site/replicate),fami...

Hello all- I am doing a survival analysis for two species of invasive plants I outplanted to edges and interiors of island and mainland sites in a local reservoir. I am using the KM estimate and had no problem doing survdiff for my data using the following code: S4<-Surv(outplant$SurvTime, outplant$StatusD6) diff4=survdiff(S4 ~ outplant$Species+outplant$SiteType+outplant$EdgInt) diff4

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