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History Matters: Path dependence and innovation in British city ...

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Table 17: Patent applications per capita<br />

Indicator<br />

Time series<br />

Data source<br />

Geographic basis<br />

Def<strong>in</strong>itions<br />

Comments<br />

Annual EPO patent applications per million resident population.<br />

1977 to 2002 (annual); although data for some <strong>city</strong>-regions is miss<strong>in</strong>g for some of the earlier years.<br />

Eurostat, Regio database; plus ONS, mid-year population estimates.<br />

Data for NUTS2 areas is best-fit to 1998 TTWA boundaries.<br />

Applications are broken down by IPC section <strong>and</strong> class.<br />

NUTS2 areas do not provide a good geographic fit to 1998 TTWA (<strong>city</strong>-region) boundaries. In<br />

some cases, the NUTS2 area <strong>in</strong>cludes more than one <strong>city</strong>-region, <strong>and</strong> separate figures cannot<br />

therefore be obta<strong>in</strong>ed for these cities (e.g. Cambridge & Norwich; Leeds & Wakefield).<br />

Table 18: Employment diversity <strong>in</strong>dex<br />

Indicator<br />

Time series<br />

Data source<br />

Geographic basis<br />

Def<strong>in</strong>itions<br />

Herf<strong>in</strong>dahl-Hirschman diversity <strong>in</strong>dex for the <strong>city</strong>-region’s employment base.<br />

1981, 1991, 2005 (economic trough years).<br />

ONS, 1981 Census of Employment; 1991 Annual Employment Survey; 2005 Annual Bus<strong>in</strong>ess<br />

Inquiry.<br />

Data for local authority districts is best fit to 1998 TTWA boundaries (pre-1996 districts are<br />

used for 1981 data).<br />

Herf<strong>in</strong>dahl-Hirschman diversity <strong>in</strong>dex is calculated as the sum of the squared percentage<br />

employment shares of all 3-digit sectors of the 1992 SIC (except for 1981 which is based on<br />

the 1980 SIC at 3-digit level).<br />

Higher <strong>in</strong>dex values <strong>in</strong>dicate a less sectorally diverse employment structure.<br />

The <strong>in</strong>dex can be st<strong>and</strong>ardised by multiply<strong>in</strong>g the H-H <strong>in</strong>dex value by the number of sectors<br />

<strong>and</strong> divid<strong>in</strong>g by 100; an equal distribution of employment across all sectors would then<br />

produce a st<strong>and</strong>ardised <strong>in</strong>dex value of 100.<br />

Comments<br />

The 1981 <strong>in</strong>dex is not directly comparable with that for 1991 <strong>and</strong> 2005, due to the use of a<br />

different version of the SIC.<br />

Table 19: Employment diversity with<strong>in</strong> sectors<br />

Indicator<br />

Time series<br />

Data source<br />

Geographic basis<br />

Def<strong>in</strong>itions<br />

Herf<strong>in</strong>dahl-Hirschman diversity <strong>in</strong>dex, show<strong>in</strong>g employment diversity at 3-digit level with<strong>in</strong><br />

2-digit sectors (1992 SIC).<br />

2005 only.<br />

ONS, 2005 Annual Bus<strong>in</strong>ess Inquiry.<br />

Data for local authority districts is best-fit to 1998 TTWA boundaries (pre-1996 districts are<br />

used for 1981 data).<br />

See def<strong>in</strong>ition of Hirf<strong>in</strong>dahl-Hirschman <strong>in</strong>dex above.<br />

Higher <strong>in</strong>dex values <strong>in</strong>dicate less employment diversity with<strong>in</strong> the 2-digit sector.<br />

To allow comparisons between 2-digit sectors, all <strong>in</strong>dex values are st<strong>and</strong>arised by multiply<strong>in</strong>g<br />

the H-H <strong>in</strong>dex value by the number of 3-digit sub-sectors <strong>and</strong> then divid<strong>in</strong>g by 100. With an<br />

equal distribution of employment across all 3-digit sub-sectors, the st<strong>and</strong>ardised <strong>in</strong>dex value<br />

will be 100, regardless of the number of sub-sectors.<br />

Comments<br />

None.<br />

86

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