Statistics and Data Mining are powerful tools for well-measured data.
In Quality Study , there are many failure because of the badly-measured data.
Indexes are classified to "Physical index", "Sensuous index", "Psychological index" and "Calculated index". I give these names here to call. (I do not know terms for these ideas.)
|Physical index||Measuring instrument (A unit is clear)||small||m, g, pH, hour|
|Sensuous index||The sense of sight, hearing, smell||middle||taste, smell|
|Psychological index||Questionnaire||large||fearful, worry, delightful|
|Calculated index||Various Tables||large, middle||Index of Environmental Assessment , Index of Economical Assessment , Financial Index , Risk|