2.1. What is Data?¶
2.1.1. NOIR¶
Nominal
Ordinal
Interval
Ratio
2.1.2. Nominal¶
No distance
No quantities
Cannot order
2.1.3. Can calculate¶
Mode
2.1.4. Cannot calculate¶
Mean
2.1.5. Examples¶
Colors
Weather
Player numbers in football (cannot order, or cannot say that player 8 is better than 11)
2.1.6. Ordinal¶
Has order
Has numerical value
2.1.7. Can calculate¶
Mode - most common value
Median
2.1.8. Cannot calculate¶
Distance between things
2.1.9. Examples¶
Runners at the finish (they have oder, but position doesn't say about the distance)
Humidity
Rating system (5 stars movie is better than 4 stars, but there is no information how much better)
2.1.10. Interval¶
Have order
Have distance
Has scale
Has start
Has end
No absolute zero on the scale
2.1.11. Can Calculate¶
mode
median
mean
minimum
maximum
2.1.12. Examples¶
Temperature C or F (zero is just a normal number, not a start or end of a scale)
pH (pH zero is not a
Dates
2.1.13. Ratio¶
Has order, distance
2.1.14. Can Calculate¶
mode
median
mean
minimum
maximum
T-test
2.1.15. Examples¶
Kelvin temperature
Wind
Number of children