SAMPLING REALITY

# SAMPLING REALITY - SAMPLING REALITY Scales of measurement...

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SAMPLING REALITY Scales of measurement numerical values may be defined with respect to nominal, ordinal, interval, or ratio scales of measurement it is important to recognize the scales of measurement used in GIS data as this determines the kinds of mathematical operations that can be performed on the data the different scales can be demonstrated using an example of a marathon race: 1. Nominal on a nominal scale, numbers merely establish identity o e.g. a phone number signifies only the unique identity of the phone in the race, the numbers issued to racers which are used to identify individuals are on a nominal scale o these identity numbers do not indicate any order or relative value in terms of the race outcome 2. Ordinal on an ordinal scale, numbers establish order only o phone number 9618224 is not more of anything than 9618049, so phone numbers are not ordinal in the race, the finishing places of each racer, i.e. 1st place, 2nd place, 3rd place, are measured on an ordinal scale

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SAMPLING REALITY - SAMPLING REALITY Scales of measurement...

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