How to avoid value "1" is dropped in dummy interaction

[Jackson Zimmerman]

Hi All,
In the below example I want to see the interaction effects of two firm types i.e. "Family_firm" (1=family firm, 0 otherwise) and "Public_Firms" (1=public firms, 0 otherwise) those have "Political_Connection" (1=have political connection, 0 otherwise). However, the regression always drop the value "1" of "Political_Connection" and value "1" of these two firm types (as example in red below). Therefore, I cant evaluate such effects on these two different firm types. Please advice how should i deal with this problem. I used Feasible Generalized Least Square Regression and the command is:

xtgls ROA i.Family_firms##i.Political_Connection i.Public_Firms##i.Political_Connection...(with control variables, but i removed to make it short here).

Thank you all in advance!!
Jackson

VARIABLES	ROA
0b.Family_firms#0b.Political_Connection	0
	(0)
0b.Family_firms#1.Political_Connection	0.799***
	(0.172)
1.Family_firms#0b.Political_Connection	-0.224
	(0.217)
1.Family_firms#1.Political_Connection	0
	(0)
0b.Public_Firms#0b.Political_Connection	0
	(0)
0b.Public_Firms#1.Political_Connection	0.831***
	(0.0868)
1.Public_Firms#0b.Political_Connection	0.598***
	(0.205)
1o.Public_Firms#1o.Political_Connection	0
	(0)
Debt_to_Asset	-7.859***
	(0.157)
Debt_to_Equity	-0.443***
	(0.0271)
ln_TT_Asset	0.00866
	(0.0414)

[William Lisowski]

This was reposted in the more appropriate location of the General Forum, so if you have an answer, please post it to the topic at
http://www.statalist.org/forums/foru...e-1-is-dropped