Instruction: Design a Shiny application that takes user input, processes data in the backend, and returns a visualization of the results.
Context: This question evaluates the candidate's proficiency in developing complex interactive web applications using the Shiny framework.
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"To begin, let's clarify the core objective: We aim to develop a Shiny application that intuitively takes user inputs, processes these inputs through a predetermined analytical model, and visualizes the output in a manner that's both insightful and actionable. Given the breadth of possibilities, I'll zero in on a specific example to illustrate my approach."
Imagine we're working on an application designed to provide users with insights into their sales data. The user should be able to upload a dataset, select variables of interest (such as sales volume, date, and product categories), and then view various visualizations, like time series forecasts, product category performance, and anomaly detection in sales data....