search for: morrongiello

Hi I have a data comprised of repeated measures of growth (5-15 records per individual) for 580 fish (similar to Orange dataset from nlme library). I would like to standardise these growth measures (yi – ŷ/sd) using mean and standard deviation unique to each fish. Can someone suggest a function that would help me do this? I’ve had a look at scale and sweep but can’t find a worked example that does

Hi I'd like to fit an asymmetrical curve function to some physiological data. I've been told a weibull curve is a good place to start, but I'm having trouble specifying and fitting the function with nls and was wondering if someone could help. After some reading, I think the function specification I want is y=c*(x/a)^(b-1)*e^(-(x/a)^b) (from

Hi I am trying to estimate bottom temperatures over a particular depth range, based on one dataset containing synthetic temperature profiles (for set depths) and another that contains information on bathymetry. I need to do this for multiple regions and thus would ideally like an automated solution that is quicker and more accurate than the manual option I currently have! I have not had much luck