David Villegas-Ríos

8 Questions 29 Answers 0 Followers

Questions related from David Villegas-Ríos

In a mixed model, what is the effect of including a correlation or a "weights" structure on the different variances components (random and residual)?

Dear all, One can use a mixed-model framework to estimate repeatability (R) of a trait, for example a behavioral trait. Repeatability is calculated based on the two variance components obtained...

06 June 2015 6,574 2 View

How can I pass a grid into kernelUD (package adehabitatHR) in R?

Hi all, I'm trying to estimate the home range of 40 individuals with kernelUD function in adehabitatHR. I want to estimate the HR in a grid previously defined by myself. The grid includes all the...

02 February 2015 8,566 3 View

How can one interpret low loadings for all variables in the principal component of a PCA analysis?

Hi. I used PCA to extract the principal components of a set of 5 variables. The eigenvalue of the first component is 1.98, and for the second is 0.98. So I retain the first PC (because it is...

10 October 2014 2,935 7 View

How many components should be Varimax-rotated after PCA (with prcomp in R)?

Hi. I ran a PCA with 5 variables, and it seems that I should retain only one PC, which accounts for 70% of the variation. The PC2 eigenvalue is 0.9. I was wondering: 1- if it makes any sense to...

10 October 2014 2,827 11 View

How to deal with maximum latency times in behavioral experiments?

I run some experiments on fish behavior , and extracted some variables from each test (tests are replicated twice). One of the variable is "latency to exit a shelter" which is a classical...

09 September 2014 4,470 20 View

Can anyone suggest a software to extract behavioral variables from a video?

Hi, I have to visualize a batch of videos of fish behaviour in captivity and extract some variables from them. These are for example: total time active, total time motionless, total time in a...

07 July 2014 2,714 20 View

Has anyone tested Zootracer (from Microsoft) for animal video tracking?

I'm trying to install it but it seems the installation process cannot be completed. I follow all the instructions in the .txt doc but still, the .exe file does not run. Has anyone succesfully...

06 June 2014 3,188 22 View

Is this set up valid for automatic animal tracking?

I'm performing some experiments with fish, and I'd like to analyse the videos with a software for animal tracking that automatically recognizes the animal and plots the track, makes calculations,...

05 May 2014 8,078 6 View