distance-sampling

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Welcome to the distance sampling e-mail list.

This is a place to ask questions about distance sampling methodology as well as software.

More information on distance sampling can be found at http://distancesampling.org

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Eric Rexstad, l_h_marshall2

May 25

Bug in Distance 7.4 Release 1 and a work-around

Dear Distance group, Please note that this bug also affects users creating projects in Distance 7.4

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Bug in Distance 7.4 Release 1 and a work-around

Dear Distance group, Please note that this bug also affects users creating projects in Distance 7.4

May 25

alei...@gmail.com, Eric Rexstad3

May 12

Unreal density with DS

After some conversations with Gaël, we learned the point transect data set contained <40

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Unreal density with DS

After some conversations with Gaël, we learned the point transect data set contained <40

May 12

xiangjun zhou, … Eric Rexstad6

May 9

how to reflect the difference of groups quantity in distance sampling

thanks a lot , wish you a good day. 在2022年5月9日星期一 UTC+8 14:23:02<Eric Rexstad> 写道： You are

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how to reflect the difference of groups quantity in distance sampling

thanks a lot , wish you a good day. 在2022年5月9日星期一 UTC+8 14:23:02<Eric Rexstad> 写道： You are

May 9

May 6

Webinar: Advancing Marine Species Density Surface Modelling

Dear distance-sampling list, Below is notice of a free webinar on advances in density surface

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Webinar: Advancing Marine Species Density Surface Modelling

Dear distance-sampling list, Below is notice of a free webinar on advances in density surface

May 6

arthur jacquemin, Eric Rexstad4

May 6

Distance sampling replicate

Pleased to hear it Arthur. From: distance-sampling@googlegroups.com <distance-sampling@

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Distance sampling replicate

Pleased to hear it Arthur. From: distance-sampling@googlegroups.com <distance-sampling@

May 6

xiangjun zhou, Eric Rexstad3

May 4

how “group” are defined in field investigation?

thank you. I see 在2022年5月5日星期四 UTC+8 00:30:22<Eric Rexstad> 写道： A group is an assemblage of

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how “group” are defined in field investigation?

thank you. I see 在2022年5月5日星期四 UTC+8 00:30:22<Eric Rexstad> 写道： A group is an assemblage of

May 4

xiangjun zhou, … Eric Rexstad10

May 4

Is estimated "D=13.422" in this picture the last population density?

thanks a lot， I now understand it,thank you a lot ,you are a good person, wish you good day 在2022年5月4

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Is estimated "D=13.422" in this picture the last population density?

thanks a lot， I now understand it,thank you a lot ,you are a good person, wish you good day 在2022年5月4

May 4

May 4

formulas calculated density and software concluded density were different, which is right ?

在2022年5月4日星期三 UTC+8 14:19:27<xiangjun zhou> 写道： transect line units is km, perpendicular units

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formulas calculated density and software concluded density were different, which is right ?

在2022年5月4日星期三 UTC+8 14:19:27<xiangjun zhou> 写道： transect line units is km, perpendicular units

May 4

xiangjun zhou, … Eric Rexstad14

May 4

Do I need animal numbers detecte to calculate population density?

ok, I see. thanks a lot 在2022年5月4日星期三 UTC+8 13:32:31<Eric Rexstad> 写道： Perhaps you will need to

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Do I need animal numbers detecte to calculate population density?

ok, I see. thanks a lot 在2022年5月4日星期三 UTC+8 13:32:31<Eric Rexstad> 写道： Perhaps you will need to

May 4

James Long, Eric Rexstad2

May 3

James Thanks for your interest. Afraid we don't have an MSI installer for the Distance for

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James Thanks for your interest. Afraid we don't have an MSI installer for the Distance for

May 3

May 3

DSM with soap film smoother

Dear listfolks, Just wanted to post a quick update (and solution) to this thread for anyone who may

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DSM with soap film smoother

Dear listfolks, Just wanted to post a quick update (and solution) to this thread for anyone who may

May 3

xiangjun zhou, Eric Rexstad5

May 2

win10 distance spacling 7.4 warning

thank you a lot 在2022年5月1日星期日 UTC+8 15:16:05<Eric Rexstad> 写道： Very good; glad you were able to

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win10 distance spacling 7.4 warning

thank you a lot 在2022年5月1日星期日 UTC+8 15:16:05<Eric Rexstad> 写道： Very good; glad you were able to

May 2

Apr 29

Can left-truncation distances vary by object and observer?

This quotation from Laake et al. (2008) Coping with variation in aerial survey protocol for line-

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Can left-truncation distances vary by object and observer?

This quotation from Laake et al. (2008) Coping with variation in aerial survey protocol for line-

Apr 29

Fay Frost, … Eric Rexstad5

Apr 27

Only 1 level for factor covariate (when stratified)

Thanks Steve. Fay, just to amplify what Steve has said, covariates can help solve problems where no

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Only 1 level for factor covariate (when stratified)

Thanks Steve. Fay, just to amplify what Steve has said, covariates can help solve problems where no

Apr 27

Flora T, Eric Rexstad2

Apr 26

Butterfly distance sampling

Flora You might consider using line transects rather than points; detection function fitting is a bit

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Butterfly distance sampling

Flora You might consider using line transects rather than points; detection function fitting is a bit

Apr 26

Distance, Len Thomas2

Apr 4

Upcoming workshops

Registration is now open for two online interactive training workshops. Join us by video from

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Upcoming workshops

Registration is now open for two online interactive training workshops. Join us by video from

Apr 4

aschi...@gmail.com, … l_h_marshall5

Mar 31

Issue creating Study Area layer and coverage

Hi Adrian, I've had a look into this and I think it was something to do with your projection file

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Issue creating Study Area layer and coverage

Hi Adrian, I've had a look into this and I think it was something to do with your projection file

Mar 31

Melissa Costagliola - Ray, Eric Rexstad2

Mar 30

Surveys carried out from multiple land-based survey locations

Melissa There are challenges to the analysis of the survey you describe. They are highlighted in

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Surveys carried out from multiple land-based survey locations

Melissa There are challenges to the analysis of the survey you describe. They are highlighted in

Mar 30

Margaret Swift, Eric Rexstad3

Mar 23

How to use Distance Sampling along transect with obscured sightline at 0m

Hey Eric, thanks so much! I agree right-truncation is appropriate; the methods for collection

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How to use Distance Sampling along transect with obscured sightline at 0m

Hey Eric, thanks so much! I agree right-truncation is appropriate; the methods for collection

Mar 23

Sven Buchmann, … Stephen Buckland7

Mar 18

Overdispersion in point DS

I agree with Eric – I would analyse individuals. There is some discussion of the issue on pp75-76 and

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Overdispersion in point DS

I agree with Eric – I would analyse individuals. There is some discussion of the issue on pp75-76 and

Mar 18

Fay Frost, Eric Rexstad4

Mar 18

Stratifying Data by year for annual abundance estimates.

Fay Your questions: that number of detections per year is likely to be adequate. Look for indications

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Stratifying Data by year for annual abundance estimates.

Fay Your questions: that number of detections per year is likely to be adequate. Look for indications

Mar 18

Mar 17

New versions of distance sampling R packages

Dear distance-sampling list, I am pleased to announce new versions of our R packages Distance, mrds,

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New versions of distance sampling R packages

Dear distance-sampling list, I am pleased to announce new versions of our R packages Distance, mrds,

Mar 17

Arthur Jacquemin, Eric Rexstad6

Mar 14

Variance proportion

No Arthur, I did not receive an email with your data. Send it along to my personal email address, not

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Variance proportion

No Arthur, I did not receive an email with your data. Send it along to my personal email address, not

Mar 14

antom...@gmail.com, Eric Rexstad2

Mar 11

Error in data.frame(object = as.numeric(names(model$fitted)), pdot = pdot) : arguments imply differing number of rows: 0, 85

Antonela The second model uses group size as a covariate in the detection function. The software

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Error in data.frame(object = as.numeric(names(model$fitted)), pdot = pdot) : arguments imply differing number of rows: 0, 85

Antonela The second model uses group size as a covariate in the detection function. The software

Mar 11

antom...@gmail.com, Eric Rexstad4

Mar 9

Some variance-covariance matrix elements were NA

Yes Antonela. There were changes to the optimisation routines in Distance 1.0.3 as described in the

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Some variance-covariance matrix elements were NA

Yes Antonela. There were changes to the optimisation routines in Distance 1.0.3 as described in the

Mar 9

Samantha Ball, Eric Rexstad4

Mar 9

density surface modeling (dsm) for replicate surveys

Sam It is not my belief that density surface model abundance estimates using temporal replicates

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density surface modeling (dsm) for replicate surveys

Sam It is not my belief that density surface model abundance estimates using temporal replicates

Mar 9

ducros....@gmail.com, Stephen Buckland7

Mar 3

Using relative cluster size bias to correct for expected cluster sizes and calculate density and its variance in line transects

Dear Professor Buckland, Many thanks for your answer and your help. I think I now have all the

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Using relative cluster size bias to correct for expected cluster sizes and calculate density and its variance in line transects

Dear Professor Buckland, Many thanks for your answer and your help. I think I now have all the

Mar 3

Mar 3

Introductory distance sampling training workshop; registration closes in two weeks

Introductory distance sampling training workshop 11-22 April 2022 Places are still available for the

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Introductory distance sampling training workshop; registration closes in two weeks

Introductory distance sampling training workshop 11-22 April 2022 Places are still available for the

Mar 3

Carolin Klangwald, … Stephen Buckland4

Mar 2

Camera Trap Data & GoF

Thank you both for the fast responses and the feedback! Its great to have this group. I must admit I

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Camera Trap Data & GoF

Thank you both for the fast responses and the feedback! Its great to have this group. I must admit I

Mar 2

Kimberly Nielsen, Eric Rexstad2

Mar 1

using complex spatial smoothers in 'dsm'

Kim The short answer is "no", there is no integration between the MRSea package and the dsm

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using complex spatial smoothers in 'dsm'

Kim The short answer is "no", there is no integration between the MRSea package and the dsm

Mar 1

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