I want to show that if you don't take enough biopsies from the oesophagus for certain patients then you are more likely to not detect an illness . The counts in the table are the number of investigations where a sufficient number of biopsies were taken (based on a threshold number) versus whether that investigation resulted in a diagnosis of Illness.
Illness No Illness Insufficient number of biopsies 18 52 Sufficient number of biopsies 11 18
It seems obvious to me when looking at the table that you are much more likely to not pick up the disease with an insufficient number of biopsies but Chi-squared doesnt show this.
Illness<-c(18,11) No_Illness<-c(52,18) data.frame(Illness,No_Illness) chisq.test(data.frame(EoE,No_EoE))
Am I missing something here?