how to run the Gibrat's Law in Stata

[francesca maione]

Hi everybody!
I have a panel data set about an industry with the following variables:

• name of the firm
• year
• province
• codice fiscale
• number of employees
• total sales
• raw materials
• operating profits, in Aida is EBITDA
• total intangibles (immobilizzazioni materiali)
• expenses in publications
• exp. in patents
• exp. In licences
• value added
• short term debt
• debt towards the banks
• labour productivity
• growth rate in sales
• growth rate in employees

I have to verify if the firms follow the Gibrat's law, how can I do it?
Then I also to understand which are the determinants of firm growth. Somebody can help me please?

Thank you

[Nick Cox]

That's an entire project. It's a better idea to show some idea, try some code and ask more specific questions.