R Programming for Statistics and Data Science - Creating a Factor in R

The video tutorial introduces the concept of factors in R, focusing on how to represent nominal and ordinal data. It explains the creation of a vector to hold marital status data and demonstrates how to convert it into a factor variable using the factor function. The tutorial covers the default alphabetical ordering of factor levels and how to customize and order them manually. It also highlights the importance of ordering factor levels for ordinal data. The lesson concludes with a brief mention of future topics like categorical variables and dummy coding.

What is the initial data type of the 'marital status' vector in R before converting it to a factor?

• Character vector

• Logical vector

• Numeric vector

• Integer vector

What does the factor function in R do to a character vector?

• Converts it to a data frame

• Converts it to a factor

• Converts it to a logical vector

• Converts it to a numeric vector

How does R organize factor levels by default if no specific order is provided?

• Randomly

• Alphabetically

• By the order of appearance

• By frequency of occurrence

Which argument is used in the factor function to manually set the order of factor levels?

• sort

• order

• levels

• labels

What function allows you to change the names of factor levels in R?

• names

• rename

• levels

• labels

What happens to a variable when factor levels are ordered?

• It becomes a nominal variable

• It becomes a numeric variable

• It becomes an ordinal variable

• It becomes a logical variable

Which argument in the factor function is used to specify that factor levels should be ordered?

• arrange

• sort

• levels

• ordered