AFBorchert

Welcome to Wikidata, AFBorchert!

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Best regards!

‐‐1997kB (talk) 02:30, 2 February 2020 (UTC)

Call for participation in a task-based online experiment

Dear AFBorchert,

I hope you are doing well,

I am Kholoud, a researcher at King's College London, and I am working on a project as part of my PhD research, in which I have developed a personalised recommender model that suggests Wikidata items for the editors based on their past edits. I am collaborating on this project with Elena Simperl and Miaojing Shi.

I am inviting you to a task-based study that will ask you to provide your judgments about the relevance of the items suggested by our model based on your previous edits.

Participation is completely voluntary, and your cooperation will enable us to evaluate the accuracy of the recommender system in suggesting relevant items to you. We will analyse the results anonymised, and they will be published in a research venue.

The experiment should take no more than 15 minutes, and it will be held next week.

If you agree to participate in this study, please either contact me at kholoud.alghamdi@kcl.ac.uk or use this form https://docs.google.com/forms/d/e/1FAIpQLSfA1wfdBfCRlcG3WhDyc-V8lzgPNx3fDFCNXkyn4CSwahXZ_A/viewform?usp=sf_link

Then, I will contact you with the link to start the study.

For more information about my project, please read this post: https://www.wikidata.org/wiki/User:Kholoudsaa

In case you have further questions or require more information, don't hesitate to contact me through my mentioned email.

Thank you for considering taking part in this research.

Regards Kholoudsaa (talk) 17:02, 5 October 2023 (UTC)

Hi Kholoudsaa, thank you for your invitation. Please understand that I will not participate in it. One reason is limited time, the other is that I personally do not see any benefit from a possible system of recommendations. I work mainly on Wikidata objects which I have photographed before (and to some degree their wider context). My focus is on photographing and consequently at Commons. Regards, AFBorchert (talk) 20:55, 5 October 2023 (UTC)

False precision in coordinates

Thank you for finding the site of the Mamatlakala highway accident (Q125208163). However, when entering coordinates into the coordinate location (P625) field, please round to the nearest arcsecond (Q829073), lest you create false precision (Q3467464). The coordinates given on Wikidata are sometimes shown on Wikipedia, whose Project:Manual of Style (Q4994848) requests such rounding. Thanks, Abductive (talk) 02:21, 31 March 2024 (UTC)

@Abductive: Thanks for your comment. You are right that I should have rounded the coordinates. Note, however, that the coordinates I gave had a precision below an arcsecond. I used the last photo of this NYT article to locate precisely the location at the road where the bus plunged off the bridge (not its final resting position). Your rounded position is no longer on the bridge but some meters south of it where the bus hasn't been. Regards, AFBorchert (talk) 15:21, 31 March 2024 (UTC)

I do the same sort of thing all the time, looking at news photos and Google Street View. Given the errors inherent in GPS and online mapping services, one cannot expect to do any better than a tenth of an arcsecond. The current coordinates are roughly inbetween where the bus left the guardrails (say 23°58′32.6″S 28°32′06.9″E) and where its wreckage ended up (23°58′33.4″S 28°32′07.4″E). Abductive (talk) 18:22, 31 March 2024 (UTC)