How to interpret a scale created using the alpha command

[Lorena Siqueira]

I'm having a problem interpreting the scale created below.

I'm needing to group two qualitative variables, which have 4 equal response categories. I recoded what I needed and tried the following processes:

replace sp38g=. if sp38g==-1
replace sp38g=. if sp38g==-2
fre sp38g

replace sp38f=. if sp38f==-1
replace sp38f=. if sp38f==-2
fre sp38f

gen addindex = (sp38g + sp38f) -3
generate index=(sp38g + sp38f)/4

tab sp38g sp38f
gen confidence=.

replace confidence=1 if sp38g==1 & sp38f==1
replace confidence=2 if sp38g==2 & sp38f==2
replace confidence=3 if sp38g==3 & sp38f==3
replace confidence=4 if sp38g==4 & sp38f==4

alpha sp38g sp38f, gen(confidence)

However, I don't know how to interpret the results of the scale created to rewrite according to the response categories. My question is, how do I know which percentage is equivalent to which category of the previous variable?

Because the scale created gave me 7 levels, while the previous variables that were grouped had 4 levels of response.


I basically need to group these two variables together and I've tried other commands as well, but I don't know how to interpret the results.

Thank you very much in advance if you can help me!