Sebastian Kocar

Survey methodologist, statistician, data all-rounder. (Social) researcher by heart (at @IssrUq). Enjoys sports, traveling, good food, entertaining his daughter.

[Sebastian Kocar @SurveySeb]

Last month, we published another @SurveyFutures working paper. The study investigates measurement mode effects by comparing live video interviewing with in‑person interviewing in a large-scale birth cohort study. @CLScohorts @GeorgePloubidis @gabidurrant https://t.co/eblk8TBQdt

[Sebastian Kocar @SurveySeb]

Our study investigating the feasibility of using a look-up approach to collect occupation data is now available on the @SurveyFutures website: https://t.co/UhdpWT3ncE

[Sebastian Kocar @SurveySeb]

In my latest paper published in Quality & Quantity, I examine recruitment to a university-managed volunteer online panel and the impact of post-survey weighting (particularly the choice and combination of raking covariates) on sample representativeness. https://t.co/pENPsL7DBO

[Sebastian Kocar @SurveySeb]

Our paper with PJ Lavrakas is now out in the International Journal of Market Research. We examine motivations & barriers to questionnaire completion in a nonprobability online panel, and identify five distinct psychographic profiles of panellists. More at https://t.co/0mvSIGHSQY

[Survey Futures @SurveyFutures]

📣SAVE THE DATE
Our friends at @CityStGeorges will be hosting our Survey Futures international conference, taking place on 17-18 June 2026. We will explore the Future of Survey Data Collection, presenting findings from our nine research strands, plus panel discussions and more.

[Sebastian Kocar @SurveySeb]

Our evidence review on occupation coding in self-completion surveys (with Matt Brown & @_DrLisaC from @CLScohorts) is now available on @SurveyFutures website: https://t.co/kFTBE425SN (other project publications are also available there)

[Survey Futures @SurveyFutures]

Our thanks to the research leads and authors on this work @gabidurrant @SurveySeb Matt Brown, Tim Hanson, Carole Sanchez, Martin Wood, Kate Taylor, Maria Tsantani, Tom Huskinson @unisouthampton @ucl @CityUniLondon @NatCen @ipsos https://t.co/SzAVjQ337c

[International Journal of Public Opinion Research @IJPOR_Journal]

New article from @SurveySeb on the investigation between wave communications that could serve as cost-effective panel maintenance activities to increase completion in panel surveys. Read it today. https://t.co/QFxTJxelmv

[Katherine Kent @drkatherinekent]

🚨Our new paper in PHN @NS_Publications highlights the impact of food insecurity in #Tasmania

🛒 As household food insecurity worsens, diet quality declines across all food groups

🥗Solutions needed to ensure everyone has access to healthy food

https://t.co/36Qy6MIzce

[Sebastian Kocar @SurveySeb]

Just published my final piece from my PhD thesis - the article on RDD text-to-web is now available in @tweetijmr. It covers (almost) everything you need to know to implement text-to-web (with or without RDD) in practice. Read it here: https://t.co/5SLL8GJ2p3

[Sebastian Kocar @SurveySeb]

Seriousness aside, "Understanding Australia" sounds more like a hybrid between @SRCentreAUS's Life in Australia (we used data from this online panel) and Understanding Society longitudinal survey (@usociety). I do like this blended name for a future study in Australia, though.🙂

[Survey Practice @SurveyPractice]

Just published in Survey Practice! An experiment in the Understanding Australia survey shows how researchers can maximize the representativeness of panel surveys, without spending a fortune to continually recruit new participants.
#openaccess

https://t.co/hBHvJhsBPW

[Sebastian Kocar @SurveySeb]

Another paper on motivations to participate in online panels with P.J. Lavrakas has just been published in @SurveyPractice.
In this one, we present a method that could help improve representation for a very low cost by utilizing self-reported motivations: https://t.co/UUNVxvTDpF

[Sebastian Kocar @SurveySeb]

A new day, a different country, a different conference, another presentation of my methods research. This time I have the privilege to talk about my PhD thesis research (Approaches to dealing with survey errors in online panel research) at #GOR23. @dgof_gor

[Sebastian Kocar @SurveySeb]

After a stimulating first day at #WAPOR23 conference, I'm excited to present tomorrow on post-survey adjustments aimed at mitigating representation bias in an academic volunteer online panel. @WAPOR

[Sebastian Kocar @SurveySeb]

Thrilled to see our meta-analysis (with @lkaczmirek) finally out! A thorough analysis of recruitment rates/practices in 28 probability-based online panels is now published in the International Journal of Social Research Methodology at https://t.co/qTd7vZvBEY #Stats #survey

[Sebastian Kocar @SurveySeb]

Our paper with Bernie Baffour on improving accuracy of Australian nonprobability online panel samples has been published in @gesis_ord's mda: https://t.co/qcAMOz269j. While challenging, we showed how carefully designed post-survey adjustment can be successful in reducing bias.

[Katherine Kent @drkatherinekent]

Great to see our work with @ISC_UTAS being discussed on #radionational

Over half of Tasmanians suffer food insecurity https://t.co/8HLe4sYABU

[Sebastian Kocar @SurveySeb]

Very happy to see our paper with P. J. Lavrakas on Social-psychological Aspects of Probability-based Online Panel Participation published in @IJPOR_Journal, especially since we demonstrated how qualitative data can be used to study non-response phenomena: https://t.co/YBfAj4wBYn

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[Survey Practice @SurveyPractice]

Just published in Survey Practice! Using weights based on past votes to improve estimates of voting intentions.

https://t.co/lIWQ9ImrWn