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Welcome to this Google Group for discussion on spatially explicit capture-recapture methods for animal populations, and for questions related to the R package 'secr'. The scope overlaps with the Density | secr forum at www.phidot.org/forums. Note the search tool on the group website. Please use your name when posting.

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Paolo Strampelli, … Jamie Bolam - 王英龍4

Sep 2

Spatial-Mark Resight - SEs of 0 & Inability to model sex

Dear all, I am having a similar issue to the one described in this thread, and would deeply

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Spatial-Mark Resight - SEs of 0 & Inability to model sex

Dear all, I am having a similar issue to the one described in this thread, and would deeply

Sep 2

Aug 19

cluster capture-recapture - trouble shooting

Hello, I am running cluster capture-recapture models on double observer aerial surveys with uncertain

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cluster capture-recapture - trouble shooting

Hello, I am running cluster capture-recapture models on double observer aerial surveys with uncertain

Aug 19

Greg Distiller, Murray Efford4

Aug 15

Estimator unbiased with no spatial recaps

A quick follow up. I reran the sims after specifying start = NULL as part of fit.args. Now I am

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Estimator unbiased with no spatial recaps

A quick follow up. I reran the sims after specifying start = NULL as part of fit.args. Now I am

Aug 15

rebeca calanoce, Murray Efford2

Aug 8

Proximity shows as count in summary(fit)

Hi Rebeca Well spotted. To save time secr.fit automatically collapses proximity data to counts unless

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Proximity shows as count in summary(fit)

Hi Rebeca Well spotted. To save time secr.fit automatically collapses proximity data to counts unless

Aug 8

Greg Distiller, Murray Efford4

Aug 6

Interpreting the u summary from a count model with one occasion

I'm catching up - sorry for slowness. The counts are defined (eg, ?counts) as "n number of

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Interpreting the u summary from a count model with one occasion

I'm catching up - sorry for slowness. The counts are defined (eg, ?counts) as "n number of

Aug 6

Pablo Lau, Eric Howe3

Aug 5

Differences in behavior in both sex.

Good day, Yes, if there is heterogeneity in detectability among individuals (including between sexes)

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Differences in behavior in both sex.

Good day, Yes, if there is heterogeneity in detectability among individuals (including between sexes)

Aug 5

Brendan Alting, Murray Efford5

Jul 19

Thanks for getting back to me Murray, I'll look into the literature a little more. On Wednesday,

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Thanks for getting back to me Murray, I'll look into the literature a little more. On Wednesday,

Jul 19

Jul 2

Design, implement and promote species monitoring in R course

Dear all, We are excited to announce the upcoming online course “Design, implement and promote

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Design, implement and promote species monitoring in R course

Dear all, We are excited to announce the upcoming online course “Design, implement and promote

Jul 2

Rogan Fourie, Murray Efford2

Jun 26

Error while trying to run single session secr for leopard camera trap data

Hard to say without the data, but I'm guessing that a leading zero in a string of binary codes

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Error while trying to run single session secr for leopard camera trap data

Hard to say without the data, but I'm guessing that a leading zero in a string of binary codes

Jun 26

Jun 15

secr 5.2.4 etc.

Three packages were updated last week. secr 5.2.4 has mostly minor changes. Simulation of activity

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secr 5.2.4 etc.

Three packages were updated last week. secr 5.2.4 has mostly minor changes. Simulation of activity

Jun 15

Tashi Dhendup, Murray Efford4

Jun 2

SECR when sampling grids are larger than the HR

If I'm understanding right then you can divide each 4-km square into say 4 2-km squares and treat

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SECR when sampling grids are larger than the HR

If I'm understanding right then you can divide each 4-km square into say 4 2-km squares and treat

Jun 2

May 20

Error while running SECR

Hi all, I am trying to run SECR to get density estimation for Hyena. In my camera-traps, I got only 4

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Error while running SECR

Hi all, I am trying to run SECR to get density estimation for Hyena. In my camera-traps, I got only 4

May 20

Tim Henderson, … James Russell5

May 18

SECR when lots of re-captures but little/no spatial recatpures

I don't have much to add here, and agree that (at least in my experience with invasive rodents)

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SECR when lots of re-captures but little/no spatial recatpures

I don't have much to add here, and agree that (at least in my experience with invasive rodents)

May 18

Prashant Mahajan, Murray Efford7

May 14

Telemetry in SECR

Thank you so much for the clarification and highlighting the challenges involved. On Wednesday, May

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Telemetry in SECR

Thank you so much for the clarification and highlighting the challenges involved. On Wednesday, May

May 14

Ashley Cook, Murray Efford2

May 13

Congratulations for trying to understand this! I can't locate the exact equation you cite in the

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Congratulations for trying to understand this! I can't locate the exact equation you cite in the

May 13

Pablo Lau, Murray Efford6

May 8

effect of high mobility of some individuals in estimates of density

To contribute to the discussion, I am attaching a comment from David Borchers, whom I had contacted

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effect of high mobility of some individuals in estimates of density

To contribute to the discussion, I am attaching a comment from David Borchers, whom I had contacted

May 8

stefano palmero, … Murray Efford6

May 8

Beaver monitoring

Dear Murray, Thank you for the prompt response. I will probably go for abundance only. Best Stefano

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Beaver monitoring

Dear Murray, Thank you for the prompt response. I will probably go for abundance only. Best Stefano

May 8

stefano palmero, Murray Efford3

Apr 30

Trap covariates in simulations

Dear Murray, Thank you very much for the help, as always. I'll try this code out Best Stefano

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Trap covariates in simulations

Dear Murray, Thank you very much for the help, as always. I'll try this code out Best Stefano

Apr 30

dsto...@gmail.com, Murray Efford2

Apr 17

Subset capthist by trapcovnames?

subset.capthist has a traps argument, as you probably found. That can be set to any logical vector of

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Subset capthist by trapcovnames?

subset.capthist has a traps argument, as you probably found. That can be set to any logical vector of

Apr 17

Nianfan Ding, Murray Efford6

Apr 15

Recommended way to create a new mask in regionN

It's interesting to see what happens when the population occupies only part of the area covered

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Recommended way to create a new mask in regionN

It's interesting to see what happens when the population occupies only part of the area covered

Apr 15

Apr 6

If you're reading this you probably already know about spatially explicit capture-recapture, but

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If you're reading this you probably already know about spatially explicit capture-recapture, but

Apr 6

Milena Ribeiro, Murray Efford4

Apr 5

Is it possible to plot density surfaces using the groups argument?

So predictDsurface is not working for your model and mask, for some reason we cannot see. I think you

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Is it possible to plot density surfaces using the groups argument?

So predictDsurface is not working for your model and mask, for some reason we cannot see. I think you

Apr 5

Jayna Bergman, Murray Efford4

Mar 17

Issues running multisession model with multiple masks

I decided this was really a small bug in secr.fit (internally generated multi-session masks should

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Issues running multisession model with multiple masks

I decided this was really a small bug in secr.fit (internally generated multi-session masks should

Mar 17

georgie whittome

Mar 14

secr.test issue: Error in rep(1:nrow(core), nm) : invalid 'times' argument

Hello, I am trying to run the secr.test function on the following multisession model: mod <- secr.

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secr.test issue: Error in rep(1:nrow(core), nm) : invalid 'times' argument

Hello, I am trying to run the secr.test function on the following multisession model: mod <- secr.

Mar 14

Rebeca Becdach, Murray Efford3

Mar 13

secr.test error: attempt to set an attribute on NULL

The immediate problem was a bug in the simulation code (sim.detect) for the exotic case that secr.fit

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secr.test error: attempt to set an attribute on NULL

The immediate problem was a bug in the simulation code (sim.detect) for the exotic case that secr.fit

Mar 13

Brendan Alting, Murray Efford3

Feb 11

Change in addCovariates functionality?

Ah ok, no worries! Good to know it wasn't something I did. All good, I'll find a workaround.

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Change in addCovariates functionality?

Ah ok, no worries! Good to know it wasn't something I did. All good, I'll find a workaround.

Feb 11

carlo....@gmail.com, Murray Efford2

Jan 30

openCR: variance calculation failed for some beta parameters; confounding likely

Hello Carlo I can't help with the specifics, but note that the warning you got for type JSSAN is

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openCR: variance calculation failed for some beta parameters; confounding likely

Hello Carlo I can't help with the specifics, but note that the warning you got for type JSSAN is

Jan 30

Jan 25

secr 5.2.0 fixes minor bugs in derived(), sim.capthist() and addCovariates(), and a more significant

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secr 5.2.0 fixes minor bugs in derived(), sim.capthist() and addCovariates(), and a more significant

Jan 25

jcl...@utk.edu, Murray Efford7

Jan 7

changing study area size

Thank you as always Murray! On Tuesday, January 7, 2025 at 2:30:36 PM UTC-5 murray...@gmail.com wrote

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changing study area size

Thank you as always Murray! On Tuesday, January 7, 2025 at 2:30:36 PM UTC-5 murray...@gmail.com wrote

Jan 7

Amanda Zak, Murray Efford5

12/16/24

Estimating realized N within subsets of total study area

I had thought that conditioning on observed individuals would make realized estimates better, but I

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Estimating realized N within subsets of total study area

I had thought that conditioning on observed individuals would make realized estimates better, but I

12/16/24

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