pairwise comparison error message

[cg386]

I am trying to do a pairwise comparison to see which spiders are different but R keeps returning an error. I don't understand, spiders are written as words in the data set so surely should be factors automatically?

loc3glm<-glm (locomotion ~ post_handling_day+spider,

•           family = "binomial", data = threespiders)
  

loc3comparison <- glht(loc3glm, linfct = mcp(spider = "Tukey"))
Error in mcp2matrix(model, linfct = linfct) :
Variable(s) ‘spider’ of class ‘character’ is/are not contained as a factor in ‘model’

[andresrcs]

@cg386

spiders are written as words in the data set so surely should be factors automatically?

Not necessarily, why you don't simply check your assumption?

If you need specific help, please provide a proper REPRoducible EXample (reprex) illustrating your issue.