| variable type | variable symbol | variable meaning | variable measurement |
| dependent variable | TobinQ | TobinQ | market value/replacement cost |
| independent variable | Suc | Whether it is an intergenerational succession family business | the value of enterprises that go through intergenerational succession during 2010 to 2014 is 1, or else, it is 0 |
| Inhe | whether family businesses have started intergenerational succession | the value is 1 when intergenerational succession is started, or else, it is 0 | |
| mediating variable | RDin | research and development input strength | research and development expenditure/business income |
| control variable | Owner | family ownership | proportion of family ownership |
| Scale | enterprise scale | nature log logarithm of total assets | |
| Age | enterprise age | natural logarithm of listed years of enterprises | |
| ALR | asset-liability ratio | gross liability/total assets | |
| BIR | growth rate of main businesses | business volume of the current period-business volume of the prior period/business volume of the prior period | |
| Year | year | values of annual variables | |
| Industry | industry sector | dummy variables: the value of the manufacturing industry is 1 and others are 0 |