Develop dummy variable coding schemes for the following variables.
• Sex
• Marital status consisting of the following four categories: never married, now married, divorced, other (separated, widowed, etc.)
• Frequency of international travel, measured as:
1. Do not travel abroad
2. Travel abroad 1 or 2 times a year
3. Travel abroad 3 to 5 times a year
4. Travel abroad 6 to 8 times a year
5. Travel abroad more than 8 times a year