Hi everybody,

I'm running codes for for a Lee carter modeling. I compute the demogdata function in the package demography. 
Age is a class of factor

Base<-demogdata(data=x,pop=y,ages=AGE,years=YEAR,type="mortality",label="City",name="Hommes",lambda=1)
 
Now, I try to run codes for lee carter model, and i always get the following message:
Error in Summary.factor(c(1L, 2L, 24L, 35L, 46L, 57L, 68L, 79L, 90L, 101L,  : 
  max not meaningful for factors

Please can you help to understand what means this message. 

Many Thanks

Achille

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