secr.fit failed initial values not found
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Hello,
I am trying to fit a secr model to some camera trap data and I've tried a few different inputs I found when trying to find a solution and they all yield the same error/warning :
library(secr)
CH <- read.capthist(captfile = "DEC21cap2.txt",trapfile = "DEc21trap.txt", skip=1, detector = "proximity",covnames = NULL,binary.usage=TRUE)
No errors found :-)
my_traps <- traps(CH)
my_mask <- make.mask(my_traps, buffer = 3500, spacing = 1200, type = "trapbuffer")
m0<-secr.fit(CH,detectfn = "HHN", mask = my_mask, model = list(D=~1, lambda0=~1, sigma=~1))
Checking data
Preparing detection design matrices
Preparing density design matrix
Finding initial parameter values...
Warning messages:
1: In autoini(capthist = ch, mask = msk, binomN = tempbinomN, adjustg0 = details$binomN[1] == :
'dbar' close to zero; using detector spacing instead
2: In makeStart(start, parindx, capthist, mask, detectfn, link, details, :
'secr.fit' failed because initial values not found (data sparse?); specify transformed values in 'start'
initialsigma <-RPSV(captdata, CC=TRUE)[[1]]
cat("Quick and biased estimate of sigma=", initialsigma, "m/n")
Quick and biased estimate of sigma= 25.62888 m/n
fit <- secr.fit(CH, buffer = 4*initialsigma, trace = FALSE)
Warning messages:
1: In autoini(capthist = ch, mask = msk, binomN = tempbinomN, adjustg0 = details$binomN[1] == :
'dbar' close to zero; using detector spacing instead
2: In makeStart(start, parindx, capthist, mask, detectfn, link, details, :
'secr.fit' failed because initial values not found (data sparse?); specify transformed values in 'start'
library(secr)
ftraps<-read.csv("DEC21trap.csv")
names(ftraps)[2:3]<-c('x','y')
qtraps<-read.traps(data = ftraps, detector = "proximity")
cap<-read.csv("DEC21cap2.csv")
Dcap<-cap[,c(1,2,3,4)]
CH<-make.capthist(Dcap,qtraps,fmt = "trapID",noccasions = 38)
summary(CH, terse = TRUE)
Occasions Detections Animals Detectors
38 38 22 103
mask<-make.mask(qtraps,spacing = 1200)
Cats.secr0<-secr.fit(CH,model = list(D1,g01,sigma~1),mask = mask)
Checking data
Preparing detection design matrices
Preparing density design matrix
Finding initial parameter values...
Warning messages:
1: In autoini(capthist = ch, mask = msk, binomN = tempbinomN, adjustg0 = details$binomN[1] == :
'dbar' close to zero; using detector spacing instead
2: In makeStart(start, parindx, capthist, mask, detectfn, link, details, :
'secr.fit' failed because initial values not found (data sparse?); specify transformed values in 'start'
DEC21trap.csv
DEC21cap2.csv
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