Inspecting Data with glimpse, summary, head, names, and dim

Importing data is only the beginning. The data manager must inspect the dataset before trusting it. Inspection is the process of understanding what R has imported: how many rows and columns exist, what variables are present, what data types were assigned, what values appear in each field, and whether the file resembles the expected export. Inspection is not the same as full quality control, but it is the foundation for quality control.