Hello,

I have a one wave dataset of 158 firms, is it useful to cluster the standard errors? If so, I want to cluster them in industry. However, I have 35 industry dummies. I have tried to do it like the internet mentioned:

Code:
. regress abschangecarbonintensity firmsize profitability leverage age capitalintensity CAPEX KZindex elektrici
> tygenerator Carbonleakage industry10 industry11 industry13 industry16 industry17 industry19 industry20 indust
> ry21 industry22 industry23 industry24 industry25 industry28 industry29 industry30 industry35 industry42 indus
> try46 industry47 industry49 industry52 industry63 industry70 industry72 industry81 WestFlanders Hainaut Antwe
> rp Brussels FlemishBrabant Limbourg Liege Namur WalloonBrabant Luxembourg SME  publicfirm, robust cluster  in
> dustry10 industry11 industry13 industry16 industry17 industry19 industry20 industry21 industry22 industry23 i
> ndustry24 industry25 industry28 industry29 industry30 industry35 industry42 industry46 industry47 industry49 
> industry52 industry63 industry70 industry72 industry81
option cluster incorrectly specified
r(198);
but I get an error. Do you have any advice?

Kind regards,
Timea De Wispelaere