search for: tertil

Dear R gurus I am running a GLMM that looks at whether chimpanzees spend time in shade more than sun (response variable 'y': used cbind() on counts in the sun and shade) based on the time of day (Time) and the availability of shade (Tertile). I've included some random factors too which are the chimpanzee in question (Individual) and where they are in a given area (Zone). There are also two continuous predictors (Minimum daily temperature: Min; Maximum daily temperature: Max). I have run my GLMM and I know that Time and Min are si...

...e "Pr(>|z|)" value is not a definitive p-value (rather an approximation), can one treat it loosely as an 'estimated' p-value? My model comprises 2 categorical predictor variables (Time of day: 'Time'; Available amount of shade, coded as a three-way classification: 'Tertile'), two continuous predictor variables (maximum temperature: 'Max'; minimum temperature: 'Min') and three random effects (Which experimental dataset the data were derived from: 'Exp'; Which individual chimpanzee was observed: 'Indiv'; Which area/zone of the enclo...

I'm trying to devide x into tertiles, but ends up with integer limits even x holds one decimal. The analysis is extremely sensitive to the limits and I like to keep them right. How can that be done? quartiles <- quantcut( x[x >= 0], q=seq(0,1, by=(1/3)) > table(quartiles) quartiles [180,344] (344,448] (448,644] 16467...