Martin Stoffel

9 Questions 18 Answers 0 Followers

Questions related from Martin Stoffel

Does anyone know a good illustration of a population bottleneck?

I'm searching an aesthetic schematic illustration of a population bottleneck, including possible outcomes such as recovery and extinction. Any source is appreciated!

17 January 2017 444 5 View

How can I standardize the mean number of alleles for different sample sizes?

I have a variety of (microsatellite) data sets for different species and want to compare their mean genetic diversity, i.e. their mean number of alleles per locus. This is dependent on the sample...

05 January 2017 9,238 7 View

Does anyone know a tutorial for Approximate Bayesian Computation (ABC) based on microsatellites for R or the command line?

I´d like to use approximate bayesian computation to compare three different demographic scenarios (bottleneck vs. constant population vs. population decline) for several species with...

17 May 2016 6,708 15 View

Is there any R or command line program for classic genetic bottleneck tests?

I´m searching an R package or command line program to calculate heterozygosity-excess (similar to BOTTLENECK, Piry et al. 1999) and m-ratio (Garza and Williamson, 2001) tests for population...

21 April 2016 4,477 12 View

What would be a good marine model organism that is sensitive to temperature changes and acidification?

I am searching for an organism that is also easy to breed in the aquarium and reproduces relatively quickly (say up to 2 or 3 months is ok). I am open to both salt- and freshwater organisms!

27 February 2015 2,454 8 View

How to calculate the explained variance per factor in a principal axis factor analysis?

I did a principal axis factor analysis with promax (oblique) rotation in R. Now I want to compute the explained variance for all factors of my 4-factor solution. I can extract the eigenvalues but...

22 November 2014 4,765 8 View

What is the best way to select a parsimonious model for one metric dependent variable and 100 categorical predictors?

I have got a model with one continuous dependent variable and 100 categorical predictors (candidate SNP´s) with 3 levels each (homozygous for one allele, heterozygous, homozygous for the other...

03 November 2014 9,051 1 View

What's the best model to predict a categorical outcome with 41 levels (in R)?

Precisely, I want to find out which of the 4 variables can predict membership to the 41 groups (each consisting of just 2 observations).

23 September 2014 6,156 8 View

Why run a Mantel test instead of a glm? What about multiple testing?

I am currently doing an analysis where I have to do multiple Mantel tests. Concerning the problem of multiple Testing I am thinking of "rolling out" the matrices to vectors and then just do a GLM....

12 July 2014 7,921 2 View