[R-sig-eco] adehabitatLT null models question

[A.P.B. Carneiro]

Dear list,

I am using the package adehabitatLT to create null models using the 
function bellow. I set my treatment function to NULL and I included a 
constraint function based on an MCP of all my animal locations.

my.CRW <- NMs.randomCRW(na.omit(inter3), rangles = TRUE, rdist = TRUE, 
fixedStart = TRUE,
             x0 = NULL, rx = NULL, ry = NULL, treatment.func = NULL,
             treatment.par = NULL, constraint.func = consfun,
             constraint.par = GHA_const, nrep = 15)

my.sim<- testNM(my.CRW)

When I was ordering the data by dates to extract my environmental 
variables, I realised that no matter the number of nrep I perform, my 
results (locations of the null model) for a specific date are all the 
same. I don’t think this is right, correct? The idea of generating the 
crw is to have a possible distribution where the animal could have gone. 
Although the results are different than the original coordinates, 
instead of generating 15 different trajectories it is just generating 
one. Here an example of my output:

	x	y	date	Id	CRW_Id
1	4775351	1059107	13/05/2003 20:27	 O66A	1
50	4775351	1059107	13/05/2003 20:27	 O66A	2
99	4775351	1059107	13/05/2003 20:27	 O66A	3
148	4775351	1059107	13/05/2003 20:27	 O66A	4
197	4775351	1059107	13/05/2003 20:27	 O66A	5
246	4775351	1059107	13/05/2003 20:27	 O66A	6
295	4775351	1059107	13/05/2003 20:27	 O66A	7
344	4775351	1059107	13/05/2003 20:27	 O66A	8
393	4775351	1059107	13/05/2003 20:27	 O66A	9
442	4775351	1059107	13/05/2003 20:27	 O66A	10


Could you help me undertand that? Any possible solution?

Thanks a lot for your help!

Best,

Ana


-- 

PhD student