Displaying 4 results from an estimated 4 matches for "speciesid".
2010 Mar 19
0
lmer: mixed effects models: predictors as random slopes but not found in the fixed effects?
Hello all,
I using lmer to develop a mixed effects model. I start with an overly parameterized model (as suggested in Zuur et al. Mixed Effects Models and Extension in Ecology with R) that looks something like this:
m1 <- lmer( Y ~ aS + bS + c + d + e + (c|SpeciesId) + (d|SpeciesId) + (e|SpeciesId))
aS and bS are species level predictors an so do not vary within a SpeciesId. However, c, d, and e are population level predictors and can all potentially vary significantly within species.
I am trying to arrive at the best model describing Y.
I have been beginning...
2013 Sep 20
3
search species with all absence in a presence-absence matrix
Dear list
I have a matrix composed of islandID as rows and speciesID as columns.
IslandID: Island A, B, C….O (15 islands in total)
SpeciesID: D0001, D0002, D0003….D0100 (100 species in total)
The cell of the matrix describes presence (1) or absence (0) of the species
in an island.
Now I would like to search the species with absence (0)
in all the islands (I...
2014 Aug 25
5
problema con campos que tienen formato fecha
...e (BASE$Registro[m+1] == "FALSE" & m+1 <= dim(BASE)[1]) {m=m+1}
if (m+1 == dim (BASE)[1] & BASE$Registro[m+1]== "FALSE") {m+1}}
if (m == n) { (visitas[narbol,1]<-0) }
else
{visitas[narbol,1]<-(BASE$Time2[m]-BASE$Time2[n])}
visitas[narbol,2]<-BASE$SpeciesID[n]
visitas[narbol,3]<-BASE$StationID[n]
visitas[narbol,4]<-BASE$Time2[n]
visitas[narbol,5]<-BASE$Time2[m]
narbol <- narbol + 1
n = m+1
}
colnames (visitas) <- c("Duracion", "Mammal", "Arbol", "FechaI", "FechaF")
---
Graci...
2014 Aug 25
2
problema con campos que tienen formato fecha
Hola a todos,
Tengo la siguiente inquietud, espero me puedan ayudar.
Tengo una base de datos de la que estoy haciendo varios cálculos. Uno de
ellos es la diferencia entre tiempos para conocer la duración de un evento.
Aquí usé el paquete lubridate para tener fecha y hora en el formato
adecuado. Cuando hago el calculo obtengo algo como esto:
> (BASE$Time2[518]-BASE$Time2[516])
Time difference