Hi..
  
     is there a limit on the number of explanatory variables in nls ?
  
  i have a dataframe with the columns names x1,x2..,x300
  when i run nls it gives the error: " x181 not found"
  
  thought it does run when i have x1,x2,...,x170 variables.
  
  Thanks
  
  Harsh
  
  
  
		
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