r - creating a barplot showing frequency of samples using carcinoma dataset

Question

I was working on an assignment and I came across a problem that I am confused on. I am a beginner level R studio user and am unsure how to do this problem. I know how to make general barplots, but I am thrown off by how to make this specific barplot, especially subtracting 1. This is working with the carcinoma dataset.

Any help would be greatly appreciated! Thanks.

标签： rstatistics

Answer 1

The carcinoma data comes from the poLCA package.

library(poLCA)
data(caricoma)
?carcinoma

According to the help page, the data represent dichotomous ratings by seven pathologists. 1="no" and 2="yes". So subtracting 1 and taking the column sums should give you the frequencies for each pathologist.

colSums(carcinoma-1)
# A  B  C  D  E  F  G 
#66 79 45 32 71 25 66 

Graphing is facilitated by reshaping into long form so we get only two columns.

library(tidyverse)

carcinoma %>%
  pivot_longer(everything()) %>%
  mutate(value=value-1) %>%
  ggplot(aes(x=name, y=value)) +
  geom_col()