Contraitn ont he first factor loading.

[Michel Nivard]

I wish to estimate the following model:

model <- '

F1 =~ NA*V1 + V2

F2 =~ NA*V2

F1 ~ V3

F2 ~V3

V3 ~~ V3

F1~~1*F1 

F2~~1*F2 

F1~~0*F2 

V1~~0*V1 

V2~~0*V2 

V1~~0*V2

'

I estimate this model for many variable V1, and since the sign of somw of the loadings in this model is arbirtary I want to contrain all of these to be positive:

F1 =~ NA*V1 + V2

F2 =~ NA*V2

How would I make sure lavaan estimates the loading for the first incdicator AND I can constain it to > 0.0001?

Best,

Michel

[Edward Rigdon]

You can mention a variable twice--the parser figures this out. So you can write:

F1 =~ NA*V1 + a*V1 + b*V2  

and then use constraints to limit the range of a and b

a > 0

b > 0

See:

http://lavaan.ugent.be/tutorial/syntax2.html

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