Representation Advanced Quiz 1
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Quiz 1
1. In R, what does the function pivot_wider() from tidyr do?
Converts long-format data into summary statistics
Converts long-format data into wide-format by spreading key-value pairs across columns
Splits a string column into multiple columns
2. In spreadsheets, what is the difference between an array formula and a standard formula?
Array formulas can only process one cell at a time
Standard formulas can return multiple values
Array formulas can perform calculations on multiple cells or ranges simultaneously and return multiple results
3. In R, what is the purpose of the function unnest() in tidyr?
Expands list-columns into multiple rows for analysis
Combines multiple data frames into one
Creates summary statistics for grouped data
4. In spreadsheets, what is the purpose of the INDIRECT function?
Converts numbers to text automatically
Returns a cell reference or range from a text string dynamically
Splits a cell into multiple rows
5. In R, what does the function map() from purrr do?
Combines multiple data frames by a key
Filters a data frame based on a condition
Applies a function to each element of a list or vector and returns a list of results
6. In spreadsheets, what does the LET function allow you to do?
Define variables in a formula for reuse, improving readability and efficiency
Automatically update charts based on conditions
Create array formulas without specifying ranges
7. In R, what does the function nest() in tidyr do?
Expands columns into multiple rows
Collapses multiple rows into a list-column for grouped analysis
Deletes duplicate rows
8. In spreadsheets, how does the XLOOKUP function improve upon VLOOKUP?
It cannot handle approximate matches
It only searches vertically
Allows both vertical and horizontal lookups, defaults to exact match, and can return values if not found
9. In R, what is the purpose of the function recode_factor()?
Changes the levels of a factor while preserving the factor class
Converts numeric values to factors
Removes unused factor levels
10. In spreadsheets, what is the purpose of dynamic arrays?
Automatically sorts data
Allows a single formula to return multiple results that spill into adjacent cells
Hides formulas while keeping values visible
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