David Villegas-Ríos

6 Questions 17 Answers 0 Followers

Questions related from David Villegas-Ríos

How to plot predictions from a cox model with interactions, in R?

Hi. I´m running a cox model in R with the following structure: sur_Are_beh_final

30 October 2020 2,726 1 View

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...

04 June 2015 4,196 2 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...

20 October 2014 9,858 9 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...

16 September 2014 6,988 18 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...

08 July 2014 709 20 View

Which is the best free software for animal video tracking and behavioral studies of captive fish?

I'm running some behavioral trials on captive fish, like open field test, mirror test and novel object test. I'd like to analyse the data using video tracking software to get information about...

01 May 2014 8,264 31 View