[R-sig-eco] Post Hoc tests GLM

[Luis Fernando García]

Dear Fellows,

I am trying to build a model in order to test the influence of the time of
the day, on sex and behavioural category. After performing several
modelations I chosen the best model which is

glm(formula = Frec ~ Group+ Hour:Category, family = poisson)

summarizing I have

                    Df Deviance Resid. Df Resid. Dev Pr(>Chi)
NULL                                   41    6027,36
Group                 2     6,15        39    6021,21   0,0462
Category:Hour 13  5972,08        26      49,13  <0,0001


I found significative effects of sex and behaviour:time interaction.
Nevertheless I am having lot of troubles in order to make post hoc
comparison, specially in the case of Group. Does somebody know how to
perform post hoc comparisons when using GLM, if so I would really
appreciate it.

Thanks in advance for your help


(attached original data)
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Group	Hour	Category	Frec
Macho	noche	Exploraci?n	160
Macho	noche	I/acciones 	11
Macho	noche	Mantenimiento	0
Macho	noche	Alimentaci?n	140
Macho	noche	Reproducci?n	13
Macho	noche	Descanso	141
Macho	noche	Otros	2
Macho	D?a	Exploraci?n	55
Macho	D?a	I/acciones 	4
Macho	D?a	Mantenimiento	4
Macho	D?a	Alimentaci?n	12
Macho	D?a	Reproducci?n	3
Macho	D?a	Descanso	379
Macho	D?a	Otros	2
Hembra	noche	Exploraci?n	186
Hembra	noche	I/acciones 	10
Hembra	noche	Mantenimiento	0
Hembra	noche	Alimentaci?n	90
Hembra	noche	Reproducci?n	3
Hembra	noche	Descanso	173
Hembra	noche	Otros	5
Hembra	D?a	Exploraci?n	40
Hembra	D?a	I/acciones 	7
Hembra	D?a	Mantenimiento	0
Hembra	D?a	Alimentaci?n	9
Hembra	D?a	Reproducci?n	2
Hembra	D?a	Descanso	405
Hembra	D?a	Otros	1
Juvenil	noche	Exploraci?n	182
Juvenil	noche	I/acciones 	12
Juvenil	noche	Mantenimiento	0
Juvenil	noche	Alimentaci?n	116
Juvenil	noche	Reproducci?n	3
Juvenil	noche	Descanso	191
Juvenil	noche	Otros	2
Juvenil	D?a	Exploraci?n	59
Juvenil	D?a	I/acciones 	7
Juvenil	D?a	Mantenimiento	0
Juvenil	D?a	Alimentaci?n	5
Juvenil	D?a	Reproducci?n	3
Juvenil	D?a	Descanso	442
Juvenil	D?a	Otros	1