need to find underlying data
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Jeff Pigati
Sep 2, 2024, 6:18:09 AMSep 2
to OxCal
Hello - I am running the deposition model in OxCal and would like to get the calibrated age range for each centimeter of a 3 m sequence. The model runs great and I can see the .svg figure and the age ranges for the specific elevations where the samples were collected, but am not sure where to find the additional data. Any help would be appreciated! Cheers, Jeff Pigati
Christopher Ramsey
Sep 2, 2024, 6:26:09 AMSep 2
to OxCal group
Dear Jeff
You need to click on the raw view icon (≡) in the output table which is next the P_Sequence line. There is a tool there to interpolate at whatever resolution you need. The output of this can be saved as a csv file or just copied into a spreadsheet.
Using the [<< Depths] button you can select the range of depths you are interested in and the increment.
The output will have all the same elements and format as the table.
Best wishes
Christopher
> On 30 Aug 2024, at 19:21, Jeff Pigati <jeffp...@gmail.com> wrote:
>
> Hello - I am running the deposition model in OxCal and would like to get the calibrated age range for each centimeter of a 3 m sequence. The model runs great and I can see the .svg figure and the age ranges for the specific elevations where the samples were collected, but am not sure where to find the additional data. Any help would be appreciated! Cheers, Jeff Pigati
>
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You need to click on the raw view icon (≡) in the output table which is next the P_Sequence line. There is a tool there to interpolate at whatever resolution you need. The output of this can be saved as a csv file or just copied into a spreadsheet.
Using the [<< Depths] button you can select the range of depths you are interested in and the increment.
The output will have all the same elements and format as the table.
Best wishes
Christopher
> On 30 Aug 2024, at 19:21, Jeff Pigati <jeffp...@gmail.com> wrote:
>
> Hello - I am running the deposition model in OxCal and would like to get the calibrated age range for each centimeter of a 3 m sequence. The model runs great and I can see the .svg figure and the age ranges for the specific elevations where the samples were collected, but am not sure where to find the additional data. Any help would be appreciated! Cheers, Jeff Pigati
>
> You received this message because you are subscribed to the Google Groups "OxCal" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to oxcal+un...@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/oxcal/38c07cea-58a2-4cd9-8192-7546f680165bn%40googlegroups.com.
Jeff Pigati
Sep 3, 2024, 8:35:19 AMSep 3
to OxCal
Perfect - thank you!
Message has been deleted
Christopher Ramsey
Sep 13, 2024, 10:49:42 AMSep 13
to OxCal group
Dear Jeff
Yes - you can set the upper and lower boundaries in the model to have z values beyond the dated points. This is quite often done a the top but then with a constraint for a known age. In practice doing so with linearly interpolate using the average deposition rate up to the point you want - the only extra information you get is the uncertainty which will be based on the rigidity of the model. Extrapolating too far will often lead to very slow convergence and should be avoided - but minor extrapolation can be useful to give a full picture.
This will be better than post-model extrapolation. This will also work - but again is just linear and will lead to a warning message that is is doing so.
Best wishes
Christopher
> On 3 Sep 2024, at 13:44, Jeff Pigati <jeffp...@gmail.com> wrote:
>
> Christopher - Is there a way to extrapolate beyond the uppermost and lowermost ages in a sequence to estimate ages at or near the top and bottom of a sedimentary sequence in OxCal? I think this is probably a loaded question since there would have to be assumptions about constant sedimentation rates, etc., but am curious. Thanks in advance. Jeff
> To view this discussion on the web visit https://groups.google.com/d/msgid/oxcal/2a3adb2c-e120-4fad-b24d-c10ed9fa1aebn%40googlegroups.com.
Yes - you can set the upper and lower boundaries in the model to have z values beyond the dated points. This is quite often done a the top but then with a constraint for a known age. In practice doing so with linearly interpolate using the average deposition rate up to the point you want - the only extra information you get is the uncertainty which will be based on the rigidity of the model. Extrapolating too far will often lead to very slow convergence and should be avoided - but minor extrapolation can be useful to give a full picture.
This will be better than post-model extrapolation. This will also work - but again is just linear and will lead to a warning message that is is doing so.
Best wishes
Christopher
> On 3 Sep 2024, at 13:44, Jeff Pigati <jeffp...@gmail.com> wrote:
>
> Christopher - Is there a way to extrapolate beyond the uppermost and lowermost ages in a sequence to estimate ages at or near the top and bottom of a sedimentary sequence in OxCal? I think this is probably a loaded question since there would have to be assumptions about constant sedimentation rates, etc., but am curious. Thanks in advance. Jeff
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