Explanation:The basic structure of a data frame is that there is one observation per row and each column represents a variable, a measure, feature, or characteristic of that observation. 3. _________ extract a subset of rows from a data frame based on logical conditions.
A. rename
B. filter
C. set
D. subset
Answer:A
Explanation:The basic structure of a data frame is that there is one observation per row and each column represents a variable, a measure, feature, or characteristic of that observation. 3. _________ extract a subset of rows from a data frame based on logical conditions.
A. rename B. filter C. set D. subset
Explanation:rename is used to rename variables in a data frame. 4. _________ generate summary statistics of different variables in the data frame, possibly within strata