R Commander 화면 상단에서 <데이터셋 보기> 버튼을 누르면 아래와 같은 내부 구성을 확인할 수 있다.
Violent Crime Rates by US State
This data set contains statistics, in arrests per 100,000 residents for assault, murder, and rape in each of the 50 US states in 1973. Also given is the percent of the population living in urban areas.
A data frame with 50 observations on 4 variables.
Murder arrests (per 100,000)
Assault arrests (per 100,000)
Percent urban population
Rape arrests (per 100,000)
USArrestscontains the data as in McNeil's monograph. For theUrbanPoppercentages, a review of the table (No. 21) in the Statistical Abstracts 1975 reveals a transcription error for Maryland (and that McNeil used the same “round to even” rule thatR'sround()uses), as found by Daniel S Coven (Arizona).
See the example below on how to correct the error and improve accuracy for the ‘<n>.5’ percentages.
World Almanac and Book of facts 1975. (Crime rates).