Four levels of measurement of social realities, examples

FOUR LEVELS OF MEASUREMENT OF SOCIAL REALITIES

1.   NOMINAL LEVEL OF MEASUREMENT: Classification (on the base of some
attribute) Example; male & female etc. We just clssify.
2.   ORDINAL LEVEL OF MEASUREMENT: Not only classify but order it too.
Ordering; classification & ordering
3.   INTERVAL LEVEL OF MEASUREMENT: Yardstick; divided into equal intervals.
Equal intervals are very important
(Note that 1st, 2nd & 3rd are not intervals but the order)
4.   RATIO LEVEL OF MEASUREMENT: True zero concept