Afonso Dimas Martins

5 Questions 1 Answers 0 Followers

Questions related from Afonso Dimas Martins

Does Welch’s ANOVA still behave well if there's homoscedasticity?

To compare different groups under the assumption of homoscedasticity (but without assuming normality) I can just use Kruskal-Wallis test, but I'm wondering if the Welch's ANOVA (which is used when...

02 February 2019 2,425 3 View

How to avoid non-negative solutions in ODE solvers in R?

I'm using the package deSolve in R to model a biological ODE system, however I have the problem of, with certain parameters or with certain initial conditions, the ode solver produces negative...

12 December 2018 6,622 6 View

What are good modelling practices when faced with a parameter identifiability issue?

Optim function in R is not converging to the parameters that minimize the error at every iteration, which could be a sign of different parameters producing the same curve, and R isn't able to...

10 October 2018 1,052 3 View

Can endospores in Bacillus subtilis form without calcium?

Endospores form in some bacteria when essential nutrients scarce. However, calcium binds to DPA (dipicolinic acid) and this complex binds to free molecules of water, which dehydrates the...

03 March 2016 7,126 2 View

Why is N6-methyladenine so difficult to find in eukaryotes?

Why are nucleotide bases like N6-methyladenine so rare in eukaryotes? What can be the consequences of that on genetic expression?

01 January 2016 9,129 1 View