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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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Janet Mossman, Eric Rexstad4

2:20 AM

ordering of transects for use with dht2 er_est = S2 or O2

That's a good point Janet. I thought having surveyID as part of your sample label would deal with

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ordering of transects for use with dht2 er_est = S2 or O2

That's a good point Janet. I thought having surveyID as part of your sample label would deal with

2:20 AM

Tristen Brush, Eric Rexstad2

Feb 5

Changing sample fraction for non-random camera sites?

Tristen I understand your concern and the possible remedy you are considering. The usual answer to

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Changing sample fraction for non-random camera sites?

Tristen I understand your concern and the possible remedy you are considering. The usual answer to

Feb 5

Janet Mossman, Eric Rexstad4

Feb 5

any current errors associated with dht2 effort_sum stratification

Janet I suspect the reason "effort_sum" is a little-used method of stratification rests

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any current errors associated with dht2 effort_sum stratification

Janet I suspect the reason "effort_sum" is a little-used method of stratification rests

Feb 5

Tristen Brush, Eric Rexstad2

Feb 3

Miscalculation of dht2 CoveredArea for point transects with left truncation

Tristen Nice to hear from you again. Good of you to be closely checking your calculations. When

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Miscalculation of dht2 CoveredArea for point transects with left truncation

Tristen Nice to hear from you again. Good of you to be closely checking your calculations. When

Feb 3

Eric Enrique Flores De Gracia, Eric Rexstad3

Feb 2

Linking two different cue rates in point distance sampling

Dear Eric Thanks for your prompt reply. In fact I came over with the same error adjust.mult<-dht2(

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Linking two different cue rates in point distance sampling

Dear Eric Thanks for your prompt reply. In fact I came over with the same error adjust.mult<-dht2(

Feb 2

Benjamin Debetencourt, Eric Rexstad3

Jan 23

Extracting a density and abundance by line or camera in LTDS/CTDS

Dear Eric, Thank you very much for your detailed answer. I probably should have explained why I am

unread,

Extracting a density and abundance by line or camera in LTDS/CTDS

Dear Eric, Thank you very much for your detailed answer. I probably should have explained why I am

Jan 23

Jan 12

Species Distribution and Ecological Niche Modelling in R course

Dear all, There are only 2 seats available for the online course Species Distribution and Ecological

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Species Distribution and Ecological Niche Modelling in R course

Dear all, There are only 2 seats available for the online course Species Distribution and Ecological

Jan 12

Tristen Brush, Eric Howe2

Jan 5

Estimating distance to groups

Good day Tristen, Recording distances to only the nearest animal will cause bias (negative bias in

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Estimating distance to groups

Good day Tristen, Recording distances to only the nearest animal will cause bias (negative bias in

Jan 5

aschi...@gmail.com, Eric Rexstad3

12/12/25

Question about uncertainty estimation in dsm

Hi everyone, I'm copying below Eric's answer to my question. I think it might be useful to

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Question about uncertainty estimation in dsm

Hi everyone, I'm copying below Eric's answer to my question. I think it might be useful to

12/12/25

11/6/25

Movement Ecology online courses in 2026

Dear all, registrations are open for these 2 Physalia upcoming online courses: 1) Introduction to

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Movement Ecology online courses in 2026

Dear all, registrations are open for these 2 Physalia upcoming online courses: 1) Introduction to

11/6/25

vaughn...@gmail.com, … mikhail soloviev7

10/29/25

Distance sampling at sea for seabirds; best practice and tips

Hello, Vaughn, there is certain canadian experince of surveying seabirds: DA Fifield, A. Hedd, GJ

unread,

Distance sampling at sea for seabirds; best practice and tips

Hello, Vaughn, there is certain canadian experince of surveying seabirds: DA Fifield, A. Hedd, GJ

10/29/25

Val Harvey, Eric Rexstad2

10/24/25

Average probability of detection values

Val I think we have previously had requests for code to produce what you want. I ask that you read

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Average probability of detection values

Val I think we have previously had requests for code to produce what you want. I ask that you read

10/24/25

Deepti Gupta, … Eric Rexstad7

10/24/25

Regarding model selection in CDS

Thanks for resending your message Rose. Your first attempt did eventually arrive on the list, but it

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Regarding model selection in CDS

Thanks for resending your message Rose. Your first attempt did eventually arrive on the list, but it

10/24/25

Laura, … Tiago Marques3

10/15/25

Multiple year surveys: stratification or covariates?

Hi Laura, Adding to what Eric said, I'm not sure you've given us all the information required

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Multiple year surveys: stratification or covariates?

Hi Laura, Adding to what Eric said, I'm not sure you've given us all the information required

10/15/25

10/15/25

Re: [distance-sampling] Very inflated density estimates when using covariates but not on the null model

Ben Thanks for the follow-up. There's a lot going on here. Is this point transect data? Is it

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Re: [distance-sampling] Very inflated density estimates when using covariates but not on the null model

Ben Thanks for the follow-up. There's a lot going on here. Is this point transect data? Is it

10/15/25

Carlo Pecoraro2

10/10/25

online course: Design, Implement and Promote Species Monitoring in R - only 2 seats left

Good morning all, if you are interested in this training opportunity, you can stil join us. There is

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online course: Design, Implement and Promote Species Monitoring in R - only 2 seats left

Good morning all, if you are interested in this training opportunity, you can stil join us. There is

10/10/25

marianne...@gmail.com, Tiago Marques4

10/10/25

Question about overlapping segments in DSM analysis

Hi Marianne, Apart from the slight non independence issue that arises from you covering the same

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Question about overlapping segments in DSM analysis

Hi Marianne, Apart from the slight non independence issue that arises from you covering the same

10/10/25

Allison F, Eric Rexstad2

10/7/25

Question about point count distance grouping

Good morning Allison, welcome to the group. You can treat the distance data as categorical (two bins

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Question about point count distance grouping

Good morning Allison, welcome to the group. You can treat the distance data as categorical (two bins

10/7/25

9/22/25

Final call: workshop registration St Andrews introductory distance sampling (closes 26 September)

Attention students, managers and researchers who procrastinate 🐌: If you have interest in expanding

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Final call: workshop registration St Andrews introductory distance sampling (closes 26 September)

Attention students, managers and researchers who procrastinate 🐌: If you have interest in expanding

9/22/25

Laura, … Tiago Marques3

9/17/25

Aerial surveys produces peak in distance 0

Hi Laura, A possible alternative approach to the analysis that Eric is suggesting, would be to set up

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Aerial surveys produces peak in distance 0

Hi Laura, A possible alternative approach to the analysis that Eric is suggesting, would be to set up

9/17/25

Tiago Marques, Eric Rexstad2

9/17/25

Re: [distance-sampling] bootstrap abundance estimate for only one species, when ds() model uses species as covariate

Greetings Ben, welcome to the list. When performing a bootstrap, as you know, the transects are being

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Re: [distance-sampling] bootstrap abundance estimate for only one species, when ds() model uses species as covariate

Greetings Ben, welcome to the list. When performing a bootstrap, as you know, the transects are being

9/17/25

Jason Roberts, … Rachel Fewster6

9/13/25

Estimating availability from multiple surface and dive interval datasets

Hi Jason, list, I think your question boils down to asking which of your two options has better

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Estimating availability from multiple surface and dive interval datasets

Hi Jason, list, I think your question boils down to asking which of your two options has better

9/13/25

9/4/25

October introductory workshop more than half full, three more weeks of registration (26Sep25)

The introductory distance sampling workshop (06-17 October 2025) filled more than half the available

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October introductory workshop more than half full, three more weeks of registration (26Sep25)

The introductory distance sampling workshop (06-17 October 2025) filled more than half the available

9/4/25

Tristen Brush, Eric Rexstad3

9/3/25

Estimating abundance of different age/sex classes using cluster observations (CTDS)

Thanks Eric! That's what I was thinking but wanted to confirm before I go through the work of

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Estimating abundance of different age/sex classes using cluster observations (CTDS)

Thanks Eric! That's what I was thinking but wanted to confirm before I go through the work of

9/3/25

8/18/25

Intro distance sampling workshop 06-17 Oct; registration and widening participation applications now open

Interactive introductory distance sampling training The University of St Andrews has been training

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Intro distance sampling workshop 06-17 Oct; registration and widening participation applications now open

Interactive introductory distance sampling training The University of St Andrews has been training

8/18/25

Ariek Norford, Eric Rexstad3

8/11/25

ds() failing to converge on estimate?

Thank you for these suggestions! I was able to get my code running. On Monday, August 4, 2025 at 3:18

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ds() failing to converge on estimate?

Thank you for these suggestions! I was able to get my code running. On Monday, August 4, 2025 at 3:18

8/11/25

Anne, Eric Rexstad3

8/7/25

flat predictions

Thanks, Eric! Removing the 'nadj' term solved my problem. On Friday, August 1, 2025 at 10:16:

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flat predictions

Thanks, Eric! Removing the 'nadj' term solved my problem. On Friday, August 1, 2025 at 10:16:

8/7/25

E L, Eric Rexstad2

8/4/25

Assistance with broad distance bins and habitat heterogeneity

Esther Welcome to the group. You are correct that the figures you provided showed a problem in

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Assistance with broad distance bins and habitat heterogeneity

Esther Welcome to the group. You are correct that the figures you provided showed a problem in

8/4/25

RPE, Eric Rexstad2

7/25/25

error message in checkdata

Don't throw your computer out the window (there may be someone standing below your window). I

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error message in checkdata

Don't throw your computer out the window (there may be someone standing below your window). I

7/25/25

ειρηνη μαλτσακη, Eric Rexstad2

7/25/25

Irini If I understand correctly, your study area is composed of strata (subareas). Your objective (I

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Irini If I understand correctly, your study area is composed of strata (subareas). Your objective (I

7/25/25

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