Data visualization has become indispensable in an era where the sheer scale of available information routinely outpaces the capacity of traditional analytical methods to make it comprehensible. This article examines how R and RStudio, anchored by the ggplot2 package and Wilkinson's Grammar of Graphics framework, offer a robust and flexible platform for turning raw datasets into graphics that genuinely communicate. The discussion begins with foundational perceptual principles—drawing on Cleveland and McGill's hierarchy of graphical accuracy and Tufte's emphasis on integrity and minimalism—that should inform every design decision, regardless of the tool being used. From there, the article moves into the practical mechanics of working within the R ecosystem: preparing tidy data, constructing layered plots through aesthetic mappings and geometric objects, and customizing outputs for different audiences and contexts. Concrete examples from business analytics, scientific research, and public policy illustrate how the same core principles adapt to very different domains, each with its own conventions and communication challenges. Advanced topics, including interactive visualization through Plotly and web-based dashboard development with Shiny, demonstrate how R's capabilities extend well beyond static figures into exploratory and stakeholder-facing applications. The article also confronts common pitfalls—misleading axis choices, accessibility oversights, and ethical lapses in data representation—offering practical guidance for avoiding them. By weaving together cognitive science, design thinking, and hands-on technical implementation, this article aims to serve analysts, researchers, and decision-makers who want their visualizations to be not just technically correct but genuinely clear and useful.
R. C. Sharma (Tue,) studied this question.