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getting frequency count of factor variables

on

I want to find out what percentage of patient population that was assaulted, i.e those with ICD9== Y.04.0XXA are male or female, white or non white. Dataframe is called trauma, it has all icd9 that start with S,T, W, Y. 

names(trauma) 
Patient.Account.number, ICD.9.code, Patient.Gender, Patient.Race, Patient.Age

summarise(trauma[trauma$ICD.9.Code=="Y04.0XXA",], 
          count= count(as.factor(Patient.Gender)))

Error in summarise_impl(.data, dots) :
Evaluation error: no applicable method for 'groups' applied to an object of class "factor".

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