{
    "action": "final",
    "content": "## Missing Values Analysis\n\nThree columns in the Titanic dataset contain missing values:\n\n1. **Cabin** — 687 missing values (77.1% of all rows)\n   - This is by far the most incomplete column, with over three-quarters of passengers having no cabin information recorded.\n\n2. **Age** — 177 missing values (19.87% of all rows)\n   - Nearly one in five passengers is missing age data.\n\n3. **Embarked** — 2 missing values (0.22% of all rows)\n   - Only two passengers lack embarkation port information, making this essentially complete.\n\nAll other columns (Pclass, SibSp, PassengerId, Ticket, Survived, Parch, Name, Sex, Fare) have **zero missing values** — they are 100% complete across all 891 passengers.\n\nThe high missingness in Cabin (77%) suggests this field was not systematically recorded for most passengers, likely reflecting differences in record-keeping between passenger classes or embarkation points. Age missingness at ~20% is substantial enough to require careful handling in any survival analysis that depends on age as a factor."
}