search for: interspecif

...need to see whether I have a significant block effect and as it will be a random effect, I need to use lme in R. At each watering treatment, I had 5 different combinations of plants. I have shown how I have labelled these in brackets for species A: A in isolation (Aiso) A+A monoculture (Amono) A+B interspecific competition (Amix) .. and the same combinations for species B. I have final biomass data for each of the plants. My first step is to check species A for interspecific competition, for which I will use: Response variable: Amix (continuous - biomass measurement) Random effect: Block (factor...

Hi, I am analysing a dataset containing genetic distances within and between species. I want to show a overlap of the distributions of the intra- and interspecific values; on a second graph I use a cut-off value to determine these boundaries. As the dataset contains >30 000 values, I would like to do this with a simple line rather than superimposed histograms. Hence, density plots. With the standard settings of plot(density(x)), I receive the desirab...

Dear R members, I am new in using frailty models in survival analyses and am getting some contrasting results when I compare the Wald and likelihood ratio tests provided by the r output. I am testing the survivorship of different sunflower interspecific crosses using cytoplasm (Cyt), Pollen and the interaction Cyt*Pollen as fixed effects, and sub-block as a random effect. I stratified the analysis by developmental stage (G_stageSM) as an ordered factor (two classes). There is a lot of tied deaths in this dataset. Below is the analysis...