Dear Statalist community,
I am executing a Diff-in-diff estimation.
My data is on the municipal-level and comprises the years 1936-2011.
Municipal-year-level observations;
Municipality:= 1,..,1442;
year:= 1936,..,2011.
My treatment:
around 450 Municipalities were struck by a seismic event of major force:
I expect the municipalities affected by such an event to display lower population density growth in the long-run.
My dependent variable: population density / population density growth = popdensity
My independent variable: dummy for earthquake presence in municipality m and year t = EQ
My baseline regression:
So I modeld the regression with lags and leads (and fixed effects etc.) this way:
My Questions:
1.
What does it mean if in my results the coefficient for a lag is significant?
that the treatment was anticipated and the population density was sinking/rising even before ?
Or that the treatment has delayed effects on the population density?
2.
I have data for each year so the coefficient of my earthquake dummy reflects the effect on population density of the next year...
Is there a model or command in stata to infer the long-run effects on the population density of said municipality?
Here an example of my dataset for one Municipality (Avezzano in this case (lovely village in central Italy))
As always thank you very much for your support/help in advance!
Kind regards,
Loris
I am executing a Diff-in-diff estimation.
My data is on the municipal-level and comprises the years 1936-2011.
Municipal-year-level observations;
Municipality:= 1,..,1442;
year:= 1936,..,2011.
My treatment:
around 450 Municipalities were struck by a seismic event of major force:
I expect the municipalities affected by such an event to display lower population density growth in the long-run.
My dependent variable: population density / population density growth = popdensity
My independent variable: dummy for earthquake presence in municipality m and year t = EQ
My baseline regression:
Code:
reg popdensity EQ $control, vce(cluster provcode)
Code:
xtreg popdensity f2_EQ f1_EQ EQ l1_EQ l2_EQ l3_EQ $control i.Year#i.regioncode, fe cluster(provcode)
My Questions:
1.
What does it mean if in my results the coefficient for a lag is significant?
that the treatment was anticipated and the population density was sinking/rising even before ?
Or that the treatment has delayed effects on the population density?
2.
I have data for each year so the coefficient of my earthquake dummy reflects the effect on population density of the next year...
Is there a model or command in stata to infer the long-run effects on the population density of said municipality?
Here an example of my dataset for one Municipality (Avezzano in this case (lovely village in central Italy))
Code:
* Example generated by -dataex-. To install: ssc install dataex clear input int Year str43 Municipality float(f2_EQ f1_EQ EQ l1_EQ l2_EQ) 1936 "AVEZZANO" 0 0 0 . . 1937 "AVEZZANO" 0 0 0 0 . 1938 "AVEZZANO" 0 0 0 0 0 1939 "AVEZZANO" 0 0 0 0 0 1940 "AVEZZANO" 0 0 0 0 0 1941 "AVEZZANO" 0 0 0 0 0 1942 "AVEZZANO" 0 0 0 0 0 1943 "AVEZZANO" 0 0 0 0 0 1944 "AVEZZANO" 0 0 0 0 0 1945 "AVEZZANO" 0 0 0 0 0 1946 "AVEZZANO" 0 0 0 0 0 1947 "AVEZZANO" 0 0 0 0 0 1948 "AVEZZANO" 0 0 0 0 0 1949 "AVEZZANO" 0 0 0 0 0 1950 "AVEZZANO" 0 0 0 0 0 1951 "AVEZZANO" 0 0 0 0 0 1952 "AVEZZANO" 0 0 0 0 0 1953 "AVEZZANO" 0 0 0 0 0 1954 "AVEZZANO" 0 0 0 0 0 1955 "AVEZZANO" 0 0 0 0 0 1956 "AVEZZANO" 1 0 0 0 0 1957 "AVEZZANO" 0 1 0 0 0 1958 "AVEZZANO" 0 0 1 0 0 1959 "AVEZZANO" 0 0 0 1 0 1960 "AVEZZANO" 0 0 0 0 1 1961 "AVEZZANO" 0 0 0 0 0 1962 "AVEZZANO" 0 0 0 0 0 1963 "AVEZZANO" 0 0 0 0 0 1964 "AVEZZANO" 0 0 0 0 0 1965 "AVEZZANO" 0 0 0 0 0 1966 "AVEZZANO" 0 0 0 0 0 1967 "AVEZZANO" 0 0 0 0 0 1968 "AVEZZANO" 0 0 0 0 0 1969 "AVEZZANO" 0 0 0 0 0 1970 "AVEZZANO" 0 0 0 0 0 1971 "AVEZZANO" 0 0 0 0 0 1972 "AVEZZANO" 0 0 0 0 0 1973 "AVEZZANO" 0 0 0 0 0 1974 "AVEZZANO" 0 0 0 0 0 1975 "AVEZZANO" 0 0 0 0 0 1976 "AVEZZANO" 0 0 0 0 0 1977 "AVEZZANO" 0 0 0 0 0 1978 "AVEZZANO" 0 0 0 0 0 1979 "AVEZZANO" 0 0 0 0 0 1980 "AVEZZANO" 0 0 0 0 0 1981 "AVEZZANO" 0 0 0 0 0 1982 "AVEZZANO" 0 0 0 0 0 1983 "AVEZZANO" 0 0 0 0 0 1984 "AVEZZANO" 0 0 0 0 0 1985 "AVEZZANO" 0 0 0 0 0 1986 "AVEZZANO" 0 0 0 0 0 1987 "AVEZZANO" 0 0 0 0 0 1988 "AVEZZANO" 0 0 0 0 0 1989 "AVEZZANO" 0 0 0 0 0 1990 "AVEZZANO" 0 0 0 0 0 1991 "AVEZZANO" 0 0 0 0 0 1992 "AVEZZANO" 0 0 0 0 0 1993 "AVEZZANO" 0 0 0 0 0 1994 "AVEZZANO" 0 0 0 0 0 1995 "AVEZZANO" 0 0 0 0 0 1996 "AVEZZANO" 0 0 0 0 0 1997 "AVEZZANO" 0 0 0 0 0 1998 "AVEZZANO" 0 0 0 0 0 1999 "AVEZZANO" 0 0 0 0 0 2000 "AVEZZANO" 0 0 0 0 0 2001 "AVEZZANO" 0 0 0 0 0 2002 "AVEZZANO" 0 0 0 0 0 2003 "AVEZZANO" 0 0 0 0 0 2004 "AVEZZANO" 0 0 0 0 0 2005 "AVEZZANO" 0 0 0 0 0 2006 "AVEZZANO" 0 0 0 0 0 2007 "AVEZZANO" 0 0 0 0 0 2008 "AVEZZANO" 0 0 0 0 0 2009 "AVEZZANO" 0 0 0 0 0 2010 "AVEZZANO" . 0 0 0 0 2011 "AVEZZANO" . . 0 0 0 end format %ty Year
As always thank you very much for your support/help in advance!
Kind regards,
Loris