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    "# Data understanding of Titanic dataset\n",
    "\n",
    "Analyze the *titanic2* dataset.\n",
    "\n",
    "1. Use *titanic_train.csv*.\n",
    "2. Find out size of dataset, if there is a column with ID and if there are duplicated rows.\n",
    "3. Check data quality: proper types for columns, presence of missing and unexpected values.\n",
    "4. What columns can be important and unimportant for predicting the probability of surviving? Focus on them and check:\n",
    "   - validity and distribution of their values\n",
    "   - relationship of each to the `survived` column\n",
    "5. Find out companies of passengers travelling on a common ticket (more than one person). What other columns have same value for same ticket? What are the most typical cases of such companies?"
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