R Programming: read_csv() Function
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Questions and Answers

What is the main difference between read.csv() and read_csv() functions?

  • read.csv() creates a data frame and read_csv() creates a tibble (correct)
  • read.csv() is only for CSV files and read_csv() is for other file types
  • read.csv() creates a tibble and read_csv() creates a data frame
  • read.csv() is faster and read_csv() is slower

    • What is the purpose of the 'col_names' argument in the read_csv() function?

  • To specify whether the first column contains variable names (correct)
  • To specify the number of rows to read
  • To specify the path and name of the file to be imported
  • To specify the data type of each column

    • What is the default behavior of the read_csv() function when it comes to determining the data type of each column?

  • It guesses the data type based on the first 1000 rows (correct)
  • It asks the user to specify the data type
  • It guesses the data type based on the first 100 rows
  • It always assumes the data type is character

    • What is the purpose of the 'n_max' parameter when reading a CSV file?

    <p>To specify the maximum number of records to read</p> Signup and view all the answers

    What is the purpose of the 'na' argument in the read_csv() function?

    <p>To specify the character vector of strings used for missing values</p> Signup and view all the answers

    Which function is used to read fixed-width files?

    <p>read_fwf()</p> Signup and view all the answers

    What is the purpose of the 'comment' argument in the read_csv() function?

    <p>To specify the string used to identify comments</p> Signup and view all the answers

    What is the purpose of the 'parse_number()' function?

    <p>To ignore non-numeric characters before and after the number</p> Signup and view all the answers

    What is the advantage of using the read_csv() function over the read.csv() function?

    <p>It is typically much faster than read.csv()</p> Signup and view all the answers

    What format does the 'parse_datetime()' function expect for date-time values?

    <p>ISO8601</p> Signup and view all the answers

    What is the default type of column when reading a CSV file with string values?

    <p>Character vector</p> Signup and view all the answers

    What is the purpose of the 'parse_factor()' function?

    <p>To create factors with custom levels and order</p> Signup and view all the answers

    What is the primary function of the readxl package?

    <p>To read xls and xlsx files</p> Signup and view all the answers

    What is the main characteristic of a tidy data?

    <p>Each variable has its own column, each observation has its own row, and each value has its own cell</p> Signup and view all the answers

    What is the purpose of the gather() function in the tidyr package?

    <p>To gather values into a single column</p> Signup and view all the answers

    What is the default data type for gathered names in the gather() function?

    <p>Character</p> Signup and view all the answers

    What is the purpose of the haven package?

    <p>To read SPSS, Stata, and SAS files</p> Signup and view all the answers

    What is the term for the process of rearranging data into a consistent and useful format?

    <p>Tidying data</p> Signup and view all the answers

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