Rate : Tress Index of economic specialisation

Rates are used to define comparative statistics that can be mapped and graphed. For example, our occupational information includes counts of the number of workers in employment and out of employment, as well as the total number of workers. We then define a measure called the 'Unemployment Rate', which uses the number out of work rather than the number in work, and expresses it as a percentage of the total, rather than a rate per thousand. The descriptive text in the system is defined mainly for rates.

Tress Index of economic specialisation
Rate (R)
IND_TRESS_INDEX:sic2007_18way * 1.0 / IND_TRESS_INDEX:constant
Display as:
Continuous time series
This index of economic specialisation was proposed by R.C. Tress in his 1938 paper, "Unemployment and the Diversification of Industry" (The Manchester School, 9(2):140-152. A value of 0 indicates that each category in the classification contains an equal number of workers, and a value of 1 indicates that all workers are in just one of the categories, so the higher the value the more specialised an area is. The values depend partly on the particular industrial classification used, and here we use the "Sections" of the Standard Industrial Classification (2007) as used in reporting results from the 2011 Census. This means that Sections R, S, T and U are merged, giving 18 Sections in all.

Rate " Tress Index of economic specialisation " is contained within:

Themes, which organise the database into broad topics:

Entity ID Entity Name
T_IND Industry

Rate " Tress Index of economic specialisation " contains no lower-level entities.