Unit Outlines：
◆ AS3-1: Digital Detective
◇ Date/Time & Location
◇ Group Operation: table & tapply
◆ AS3-2: Stock Price
◇ Time Series Data
◇ Trend in Line Plots
◇ Iterative List Operation
◆ AS3-3: US Census
◇ Missing Value (NA)
◇ Merging Data Frames
Assignment Notebook：
◆ AS3-1: Digital Detective (html)
◆ AS3-2: Stock Market Dynamics (html)
◆ AS3-3: US Census Data (html)
Google Drive：
Homework Assignment： Due: 2026/09/28 (Mon.) 23:59
Personal Assignment：
◆ Complete and Annotate Notebooks unit2C, knit and upload to
the folder [ ~/person/03_unit02C/ ] with filename “student_id_unit2C.html”
Group Assignment：
◆ Complete Notebooks AS3-(1|2|3), knit and upload to
[ ~/group/Group#/ ] with filename “G#_AS2-(1|2|3).html”
Reference Links：
◆ John Hopkins: R Programming online course
◆ John Hopkins: R Programming eBook
◆ Harvard: Data Science ebook
◆ Week03 Video Recording