Levels of measurement

• Nominal data


  The most simple type of data

  shows categories of data represented by frequencies - data sets have no numerical value (boys and girls)
• Ordinal data


  Levels of measurement where data can be placed into ascending or descending order - but intervals between data are not necessarily equal
• Interval data


  equal numerical intervals between scores (e.g. temperature)
• Ratio data


  equal intervals between scores + has an absolute or true zero point