Sebastian Kocar

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 surveyfutures.net/wp-content/upl…

Our study investigating the feasibility of using a look-up approach to collect occupation data is now available on the @SurveyFutures website: surveyfutures.net/wp-content/upl…

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. doi.org/10.1007/s11135…

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 doi.org/10.1177/147078…

📣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.

Our evidence review on occupation coding in self-completion surveys (with Matt Brown & @_DrLisaC from @CLScohorts) is now available on @SurveyFutures website: surveyfutures.net/wp-content/upl… (other project publications are also available there)

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 surveyfutures.net/working-paper-…

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. bit.ly/3UfcDs3

🚨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 doi.org/10.1017/S13689…

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: doi.org/10.1177/147078…

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.🙂

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: surveypractice.org/article/88139-…

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

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

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 doi.org/10.1080/136455… #Stats #survey

Our paper with Bernie Baffour on improving accuracy of Australian nonprobability online panel samples has been published in @gesis_ord's mda: doi.org/10.12758/mda.2…. While challenging, we showed how carefully designed post-survey adjustment can be successful in reducing bias.

Great to see our work with @ISC_UTAS being discussed on #radionational Over half of Tasmanians suffer food insecurity abc.net.au/radio/programs…

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: doi.org/10.1093/ijpor/…

Registered Report authors! 🚫Had a manuscript rejected? ↩️Withdrawn a manuscript? Share your experiences and help build a picture of how @RegReports peer review is implemented across journals: registeredreports.cardiff.ac.uk/feedback 📊Current stats: 246 pieces of feedback across 54 journals

Just published in Survey Practice! Using weights based on past votes to improve estimates of voting intentions. surveypractice.org/article/70438-…