Hi all,

When I run a regression, I got the following response.  your help is appreciated.  

Error in constants (lhs, cnames_symb) : 
  The hypothesis
"Cost_PKL-QK.X_(Intercept)=0" is not well formed: contains bad
coefficient/variable names.  In addition:
Warning message:
In constants(lhs, cnames_symb) : NAs introduced by coercion

Dereje
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