[R-sig-Geo] Liker brownian analysis - probleme to find a sig1 -

[samuel pereira-dias]

Hi everyone,
I would like to run a kernel brownian bridge analysis with kernelbb and
liker function on adehabitatHR.
I've some problems with the liker output with my ltrj object below:

My ltraj object:
> tr

*********** List of class ltraj ***********

Type of the traject: Type II (time recorded)
* Time zone unspecified: dates printed in user time zone *
Irregular traject. Variable time lag between two locs

Characteristics of the bursts:
    id burst nb.reloc NAs          date.begin            date.end
1 5778  5778      116   0 2017-08-08 09:00:45 2018-05-16 12:00:01
2 5779  5779       94   0 2017-08-02 02:00:41 2018-07-17 16:00:01
3 5780  5780       43   0 2018-05-01 04:00:01 2018-05-29 16:00:01
4 5781  5781       83   0 2018-05-01 04:00:01 2018-06-17 04:00:01
5 6539  6539      194   0 2018-07-11 12:00:01 2018-08-31 16:00:01
6 6540  6540      572   0 2018-07-25 12:00:15 2019-08-21 08:00:01

and
> liker(tr, sig2 = 80, rangesig1 = c(1, 100))
*****************************************

Maximization of the log-likelihood for parameter
sig1 of brownian bridge

5778 : Sig1 = 1 Sig2 = 80
5779 : Sig1 = 1 Sig2 = 80
5780 : Sig1 = 1 Sig2 = 80
5781 : Sig1 = 1 Sig2 = 80
6539 : Sig1 = 1 Sig2 = 80
6540 : Sig1 = 1 Sig2 = 80

Why do I get a maximum of 1 for each of my individuals with the liker
function of adehabitatHR ?

Despite the huge documentation on internet, i am blocked.
Hope someone can help,
In advance thanks!

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