--- Ana Gabriela Guerrero Serdan <[email protected]> wrote:
> I have data on victimes. The weapons used are
> reported. Var cau*1 refers to the type of
> aggression and cau1* to the weapon used. "-" means
> no information.
>
> For some victimes there are two or more types of
> aggression reported as well as type of weapon, up to
> nine types. Im only including a few below.
>
> Im trying to isolate cases in which only one weapon
> is being used by creating a variable (dummy) that will
> indicate that that victim was only agressed by only
> that type of weapon.
You can use logical operators here if you know that a
true statement is given the value 1 and a false
statement the value zero. So if you create a new
variable using:
gen weapon1 = cau12 != "-"
and realize that cau12 != "-" is a logical statement
saying: "cau12 is not equal to -", than you can see
that the new variable weapon1 will contain a 1 if
cau12 contains a weapon and a 0 if no information.
This way you can make weapon2, weapon3, etc. The
sum of weapon1 till weapon9 is the total number of
weapons used. If this variable is called nweapons,
you can make the dummy using:
gen singleweapon = nweapons == 1
see the example below:
*----------------------- begin example -----------------
drop _all
input long victim ///
str5 incident ///
str6 cau11 ///
str7 cau12 ///
str6 cau21 ///
str7 cau22 ///
str6 cau31 ///
str7 cau32
49711 d0096 Ground Gunfire Ground Gunfire Ground Knife
49713 d0097 Other - Other - - -
49712 d0097 - - - - - -
49714 d0097 Ground Gunfire - - - -
49595 d0098 Ground Bombs - - - -
49596 d0098 Ground Bombs - - - -
49599 d0099 Ground Gunfire - - - -
49598 d0099 Ground Gunfire - - - -
49597 d0099 Ground Gunfire - - - -
49602 d0100 Ground Gunfire Ground Bombs - -
49603 d0100 Ground Gunfire Ground Bombs - -
49601 d0100 Ground Gunfire Ground Bombs Ground Nuke
end
gen nweapons = 0
forvalues i = 1/3 {
gen weapon`i' = cau`i'2 != "-"
replace nweapons = nweapons + weapon`i'
}
gen byte singleweapon = nweapons == 1
tab singleweapon nweapons
*------------------------ end example ---------------------------
(For more on how to use examples I sent to the Statalist, see
http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )
Hope this helps,
Maarten
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
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