Interval scales EXamples from the 1997 Survey 302Have you ever had any live birth? If yes, howman For interval data both ordering and Have you ever had any foetus death or still birth? If yes, how many? magnitude are important. The number Have you ever experenced induced abortion? If yes, how many times? given to interval data represents actual Are you currently pregnant? measurable quantities. In addition, interval 201. At what age did you have your first Examples are age, children ever born, the menstruation? number of road fatalities in a given period 313. Number of month into pregnancy at last or the number of doctors in an area nduced abortion 315. Number of days of rest after you had induced nterval scales Years of schooling For example the number of times a woman has given birth provides a variable 103. What is vour educational level with a range starting from 0 where the 1). literate or semi-literate difference between 1 and 2 is the same as the difference between 4 and 5. that is Junior middle school one child. a larger number indicates that a 4. Senior middle scho woman has had more children ) Secondary techm cal 6). College and above9 17 Interval scales • For interval data both ordering and magnitude are important. The number given to interval data represents actual measurable quantities. In addition, interval data can only take on specified values. Examples are age, children ever born, the number of road fatalities in a given period or the number of doctors in an area. 18 Interval scales • For example the number of times a woman has given birth provides a variable with a range starting from 0 where the difference between 1 and 2 is the same as the difference between 4 and 5, that is, one child. A larger number indicates that a woman has had more children. 10 19 Examples from the 1997 Survey 201. At what age did you have your first menstruation? 313. Number of month into pregnancy at last induced abortion 315. Number of days of rest after you had induced abortion 20 Years of schooling 16 12 12 9 6 0