Levels of measurement

• There are 4 levels of measurement, nominal, ordinal, interval and ratio
• Nominal data is data which is in separate categories, such as grouping people according to their favourite football teams.
• Ordinal data is data which is ordered in some way, for example ordering people based on their height. The difference between each piece of data is not the same.
• Interval data is data which is measure in units of equal interval. this does not have a true point of zero.
• Ratio data is the same as interval, it is measured in equal intervals, but it does have a true point of zero.
• how do you remember the 4 levels of measurement?

  NOIR - nominal, ordinal, interval and ratio
• when the word categories is mentioned, which level of measurement is is talking about?


  Nominal