Data | Checking file existence | Importing files

Data | File Check and Import | Checking Dimensions | Checking IDs

Data | Checking data structures | assert_nrows | assert_colnames | Checking column values | NA, infinite, etc. | Greater/less than, contains, equals | Vector comparisons | na.rm | Checking for ID variables | Asserting unique combinations of ID variables | Finding duplicate observations within combinations of ID variables | Additional assert_id options