Using the titanic data again, what is the format that R imported the variable "survived"?

Question

BlackTom AI · Accepted Answer

str(titanic$survived) would display something like:  num [1:891] 0 1 1 1 0 0 ... — so "survived" was imported as numeric ("num").

1) Relevant concepts:
- R stores data in basic atomic types: numeric (double, printed as "num"), integer ("int"), character ("chr"), logical ("lgl"), and factor (for categorical data, printed as "Factor" with levels).
- When using read.csv/read.table or tidy data import, columns composed of numeric values (e.g., 0/1) are parsed as numeric by default. The str() function reports the R internal type: "num" for numeric (double) vectors.
- Factors are used when stringsAsFactors is TRUE or when a column is explicitly converted to factor; they print as Factor w/ levels.

2) Step-by-step reasoning and inspection (how you would verify):
- Run str(titanic) or str(titanic$survived). Example output:
  str(titanic$survived)
  #> num [1:891] 0 1 1 1 0 0 0 0 1 1 ...
  This output shows "num", meaning numeric vector of length 891 with values like 0 and 1.
- Alternatively check class(titanic$survived) -> "numeric" and typeof(titanic$survived) -> "double".
- You can also call is.numeric(titanic$survived) which returns TRUE; is.factor(...) returns FALSE.

3) Why "num" is correct:
- The raw values for survived are coded numerically (0/1) rather than text labels ("No"/"Yes"), so the import routine treats the column as numeric/double. R reports numeric columns as "num" in str() output. Because the values aren’t encoded as R factor levels or strings, the correct import type is numeric.

4) Why other possible types are incorrect:
- Factor: would appear as "Factor w/ X levels" and typically occurs when values are non-numeric or forced to be factor.
- Character: would be shown as "chr" and would indicate text values; not the case for 0/1.
- Integer: str would show "int" (rare unless explicitly read as integers with L or colClasses), but typical read functions produce double ("num").
- Logical: would show "lgl" with TRUE/FALSE values, not 0/1.

Conclusion: The variable "survived" was imported as numeric, reported as "num", which matches the provided answer.

Using the titanic data again, what is the format that R imported the variable "survived"?单项选择题

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