JDS Journal of Data Science 1683-86021680-743X1680-743X School of Statistics, Renmin University of China JDS1083 10.6339/22-JDS1083 Computing in Data Science ‘You Draw It’: Implementation of Visually Fitted Trends with r2d3 https://orcid.org/0000-0001-9800-7304 RobinsonEmily A.erobin17@calpoly.edu1∗ HowardReka2 VanderPlasSusan2 Department of Statistics, CalPoly-San Luis Obispo, USA Department of Statistics, University of Nebraska-Lincoln, USA Corresponding author. Email: erobin17@calpoly.edu. 20231212023212281294 Supplementary Material

‘You Draw It’ Demonstration Applet: The shiny app used to demonstrate the ‘You Draw It’ method can be accessed at https://emily-robinson.shinyapps.io/can-you-draw-it/.

Participant Data (Linear): De-identified participant data collected in the linear study and used for analyses are available to be downloaded from GitHub at https://github.com/earobinson95/sdss-2022-you-draw-it-manuscript/raw/master/data/eyefitting-model-data.csv.

Participant Data (Non-linear): De-identified participant data collected in the non-linear study and used for analyses are available to be downloaded from GitHub at https://github.com/earobinson95/sdss-2022-you-draw-it-manuscript/raw/master/data/youdrawit-model-data.csv.

Data Analysis Code: The code used to replicate the linear and non-linear study analysis in this paper can be found at https://github.com/earobinson95/sdss-2022-you-draw-it-manuscript/blob/master/analysis/data-analysis.Rmd.

297202223122022 2023 The Author(s). Published by the School of Statistics and the Center for Applied Statistics, Renmin University of China.2023 Open access article under the CC BY license.

How do statistical regression results compare to intuitive, visually fitted results? Fitting lines by eye through a set of points has been explored since the 20th century. Common methods of fitting trends by eye involve maneuvering a string, black thread, or ruler until the fit is suitable, then drawing the line through the set of points. In 2015, the New York Times introduced an interactive feature, called ‘You Draw It,’ where readers are asked to input their own assumptions about various metrics and compare how these assumptions relate to reality. This research is intended to implement ‘You Draw It’, adapted from the New York Times, as a way to measure the patterns we see in data. In this paper, we describe the adaptation of an old tool for graphical testing and evaluation, eye-fitting, for use in modern web-applications suitable for testing statistical graphics. We present an empirical evaluation of this testing method for linear regression, and briefly discuss an extension of this method to non-linear applications.

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