| adddays | Add days to a date |
| addedrows | Rows present in 'new' but not in 'old' |
| addmonths | Add months to a date |
| addweeks | Add weeks to a date |
| addyears | Add years to a date |
| aggregate | Aggregate values by group |
| antimerge | Anti-join two tables |
| applyby | Apply a function to each group |
| applycols | Apply a function to selected columns |
| as_basetable | Coerce an object to a basetable |
| assertcols | Assert that columns exist (alias) |
| assert_cols | Validation and schema helpers |
| assertcomplete | Assert that there are no missing values |
| assertkey | Assert that a key is unique (alias) |
| assertnames | Assert that required column names are present |
| assertrange | Assert that a column falls within a numeric range |
| assertrows | Assert that a row-wise condition holds for every row |
| asserttype | Assert that a column has an expected class |
| assertunique | Assert that selected columns are unique |
| assertvalues | Assert that a column only contains allowed values |
| basetable-package | Base-Faithful Tabular Data Tools |
| betweendates | Test whether a date falls within a range |
| blanktona | Recode blank strings to 'NA' |
| btread | Read a delimited text file |
| btwrite | Write a data frame to a delimited text file |
| cardinality | Distinct-value count (or proportion) per column |
| casewhen | Multi-branch selection by condition |
| ceilingdate | Round a date up to a unit |
| center | Center a vector at its mean |
| changedcols | Compare the columns of two tables |
| changedrows | Rows whose key appears in both tables |
| classes | Column classes |
| cleannames | Clean column names to a unique, syntactic form |
| collapselevels | Collapse factor levels into named groups |
| collapsetext | Collapse a vector into a single string |
| collapsevalues | Collapse values into named groups |
| colnames | Column names |
| commonnames | Column names shared by two tables |
| compact | Drop NULL elements from a list |
| compare | Compare tables |
| compareschema | Compare the schemas of two tables |
| completegrid | Complete a table grid |
| constants | Columns with a single distinct non-missing value |
| containstext | Test for a pattern match anywhere in the string |
| convertcols | Convert selected columns with a function |
| count | Count rows by group |
| countmatch | Count pattern matches per string |
| crossmerge | Cartesian join two tables |
| cumavg | Cumulative mean |
| cumcount | Cumulative row counter |
| cumedist | Cumulative empirical distribution |
| datediff | Difference between two dates |
| dateseq | Sequence of dates |
| day | Extract the day of month |
| denserank | Dense rank of a vector |
| describe | Column descriptions |
| difference | Lagged difference |
| diffrows | Set difference of rows |
| dims | Table dimensions |
| drop | Drop columns |
| duplicatekeys | Duplicated key combinations |
| duplicatenames | Duplicated column names |
| duplicaterows | Rows involved in a duplicate |
| emptycols | Columns that are entirely blank or missing |
| emptyrows | Rows that are entirely blank or missing |
| endswith | Test whether strings end with a pattern |
| equaldata | Compare two tables for equality |
| equalrows | Compare two tables' rows for equality |
| expandlevels | Add levels to a factor |
| expandrows | Repeat rows in a table |
| extract | Extract the first pattern match |
| extractall | Extract all pattern matches |
| extractbetween | Extract text between two markers |
| extractint | Extract an integer value from text |
| extractnum | Extract a numeric value from text |
| fillboth | Fill missing values both forward and backward within groups |
| filldown | Fill missing values downward |
| fillup | Fill missing values upward |
| firstby | First row within each group |
| firstcols | Move columns to the front |
| firstrows | First 'n' rows |
| floordate | Round a date down to a unit |
| foldr | Fold a vector or list from the right |
| freq | Frequency table |
| headtail | Head and tail rows |
| hour | Extract the hour |
| intersectrows | Set intersection of rows |
| invalidrows | Rows that fail a condition |
| invalidvalues | Rows whose value is not in the allowed set |
| isalpha | Test for alphabetic-only strings |
| isalphanumeric | Test for alphanumeric-only strings |
| is_basetable | Test whether an object is a basetable |
| isblank | Test for blank (missing or empty) values |
| isemail | Test whether text looks like an email address |
| isintegertext | Test whether text looks like an integer |
| isnumerictext | Test whether text looks numeric |
| isurl | Test whether text looks like a URL |
| joinrelationship | Cardinality of a join key relationship |
| jointext | Concatenate values element-wise |
| keepmissing | Keep rows with missing values |
| lagvalue | Lag a vector |
| lastby | Last row within each group |
| lastcols | Move columns to the back |
| lastrows | Last 'n' rows |
| leadvalue | Lead a vector |
| left | First 'n' characters |
| locate | Position of the first pattern match |
| locateall | Positions of all pattern matches |
| lower | Convert to lower case |
| lump | Lump infrequent values into "Other" |
| map | Map over vectors and lists |
| matchedkeys | Rows of 'x' whose key is present in 'y' |
| matchestext | Test for a full-string pattern match |
| merge | Merge two tables |
| middle | Substring between two positions |
| minute | Extract the minute |
| missingindicator | Add missingness indicators |
| missingness | Summarize missing values by column or row |
| missingrows | Return rows with missing values |
| month | Extract the month |
| move | Move columns before or after another column |
| naif | Recode matching values to 'NA' |
| nato | Replace 'NA' with a value |
| natoblank | Replace 'NA' with an empty string |
| ncols | Number of columns |
| nearestmerge | Nearest-key join |
| nearesttext | Nearest string match |
| nonequimerge | Merge two tables using non-equi (inequality) conditions |
| normalizeencoding | Normalize text encoding to UTF-8 |
| normalizeunicode | Normalize Unicode text |
| nrows | Number of rows |
| omitmissing | Drop rows with missing values |
| orderrows | Order rows by one or more columns |
| outofrange | Rows whose value falls outside a range |
| overlapmerge | Merge tables on overlapping intervals |
| padcenter | Pad text on both sides |
| padleft | Pad text on the left |
| padright | Pad text on the right |
| parsecurrency | Parse a currency string as a number |
| parsedate | Parse text as dates, trying multiple formats |
| parsedatetime | Parse text as date-times, trying multiple formats |
| parsefailures | Rows where parsing failed |
| parseint | Parse text as integers |
| parselogical | Parse text as logicals |
| parsenum | Parse text as numbers |
| parsepercent | Parse a percentage string as a number |
| percentchange | Period-over-period percent change |
| percentrank | Percentile rank of a vector |
| pick | Select columns |
| preview | Compact table preview |
| profile | Compact variable profile |
| propcount | Grouped counts with proportions |
| quantilegroup | Bin a vector into quantile groups |
| quarter | Extract the calendar quarter |
| rangemerge | Merge two tables by a range condition |
| rbindfill | Row-bind tables, filling missing columns |
| recode | Recode values by lookup (alias) |
| removeaccents | Strip accents from text |
| removeall | Remove text matching a pattern (alias) |
| removedrows | Rows present in 'old' but not in 'new' |
| removeduplicates | Remove duplicate rows, optionally by key |
| removetext | Remove text matching a pattern |
| renamecols | Rename columns |
| renamewith | Rename columns with a function |
| reorderlevels | Reorder factor levels |
| repairnames | Repair column names |
| replaceall | Recode values by lookup (alias) |
| replacecols | Replace selected columns with new values |
| replacetext | Replace a pattern with replacement text |
| replacevalues | Recode values by lookup |
| replacewhere | Replace values in selected columns where a condition holds |
| rescale | Rescale a vector to a new range |
| reverse | Reverse row order |
| right | Last 'n' characters |
| rollapply | Rolling window apply |
| rollingmerge | Rolling join two tables |
| rollmax | Rolling maximum |
| rollmean | Rolling mean |
| rollmedian | Rolling median |
| rollmin | Rolling minimum |
| rollprod | Rolling product |
| rollsd | Rolling standard deviation |
| rollsum | Rolling sum |
| rollvar | Rolling variance |
| rounddate | Round a date to the nearest unit |
| rowall | Row-wise 'all()' across columns |
| rowany | Row-wise 'any()' across columns |
| rowapply | Apply a function row-wise |
| rowcount | Count matches of a value across columns, per row |
| rowfirst | First non-missing value across columns, per row |
| rowlast | Last non-missing value across columns, per row |
| rowmax | Row-wise maximum across columns |
| rowmin | Row-wise minimum across columns |
| rownames | Row names |
| rownumber | Row position |
| sameschema | Test whether two tables share the same column names |
| samplefrac | Sample a fraction of rows without replacement |
| samplerows | Sample 'n' rows without replacement |
| second | Extract the second |
| semimerge | Semi-join two tables |
| sentencecase | Convert to sentence case |
| separate | Split one column into several |
| setthreads | Set basetable thread count for the session |
| similartext | Nearest string match (alias) |
| split | Split a table by groups |
| splitfirst | First piece after splitting on a separator |
| splitlast | Last piece after splitting on a separator |
| splittext | Split text on a separator |
| squish | Trim and collapse internal whitespace |
| stack | Stack columns |
| standardize | Standardize a vector to mean 0, SD 1 |
| startswith | Test whether strings start with a pattern |
| subset | Core data manipulation operations |
| summaries | Named grouped summaries |
| summarytab | Table 1-style descriptive summary |
| textdist | Pairwise string distances |
| textlen | Character length |
| titlecase | Convert to title case |
| tolong | Reshape columns into key/value rows |
| towide | Reshape rows into columns |
| transliterate | Transliterate text to ASCII |
| transpose | Transpose a table |
| traverse | Traverse a list of arguments |
| trim | Trim leading and trailing whitespace |
| truncate | Truncate text with an ellipsis |
| types | Column types |
| unionrows | Set union of rows |
| uniquerows | Unique rows, in memory or straight off a delimited file |
| uniques | Count of distinct values per column |
| unite | Combine several columns into one |
| unmatchedkeys | Distinct keys of 'x' absent from 'y' |
| unstack | Unstack a table |
| updatemerge | Update rows from another table |
| upper | Convert to upper case |
| week | Extract the week of year |
| weekday | Extract the weekday name |
| winsorize | Winsorize a vector at given quantiles |
| within | Modify a table within an environment |
| year | Extract the year |
| yearday | Extract the day of year |
