Error when starting analysis in SPACECAP

[kay zin]

Error in if (sigmac > 0) { : missing value where TRUE/FALSE needed In addition: Warning messages: 1: In mean.default(mdm) : argument is not numeric or logical: returning NA 2: In rnorm(1, sigma, mmdm/4) : NAs produced

Dear all, I got this error message when I run SCR model in SPACECAP. Any help please. I have no idea what is happening and I already checked my input data files. Thank you very much.

[kay zin]

I use 0.1km2 for potential homerange size. When I thought that the problem is that I have so many camera traps that have no detection, I tried to removed all the unworked camera traps. But the error is the same. Please kindly help me to solve with this and attached are the working csv files. Thank you very much.

[arjungswamy]

Hi:

It seems to me from your data that you have no spatial recaptures.
Only one individual has been recaptured, but only at the same
location. So there is no information available for SPACECAP/SCR model
to estimate the spatial components here. Hence, there is a fundamental
estimation problem.

Perhaps, reducing the spacing between detectors will help obtain some
spatial recaptures.

Regards
Arjun

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--
Arjun M. Gopalaswamy, D.Phil (Oxford)
Wildlife and Statistical Ecologist
Visiting Scientist, Statistics and Mathematics Unit, Indian Statistical
Institute, Bangalore Centre (INDIA)
Scientific Advisor (Asia and Africa programs), Wildlife Conservation
Society (USA)
Scientific Partner, Project 'Wapi Simba', Kenya Wildlife Service, Govt. of
Kenya (KENYA)

Google Scholar:
https://scholar.google.co.in/citations?user=oJYCN-oAAAAJ&hl=en

[kay zin]

Thanks Dr.Arjun for your clarification. I think that the model will work well if I got detected individuals at the detectors and the recapture rate is much less important to be feed in the model. The traps spacing is not too far and the recapture individuals are low because of the nature of the species, here crocodile, I think. As I couldn't reduce the detectors' spacing (already done surveyed), is there any other feasible solution for the attached data to run SCR model. Thank you very much indeed.

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[Sabita Gurung]

Hi Arjun, and all
Is there any requirement for minimum this re-capture rate for this size of total capture for theSPACECAP analysis to work best?

Thank you

[kay zin]

Dear Dr.Arjun, I tried to reduce the detectors’ spacing and increase the recapture Individuals as you suggested but still got same error info as I mentioned before. Therefore I would like to know whether all the detectors need to have detections and recapturements while running SCR models. Thanks much.

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Kay Zin Than

PhD Student

Landscape Ecology Group

Center for Integrative Conservation

Xishuangbanna Tropical Botanic Garden (XTBG)

Chinese Academy of Sciences (CAS)

Menglun Township, Mengla County, Yunnan Province, 666303, China

HP:  +86 18313248525

Email: kayzi...@gmail.com, kay...@xtbg.ac.cn