Colleagues
?Consider
smokers? <- c( 83, 90, 129, 70 )
patients <- c( 86, 93, 136, 82 )
?prop.trend.test(smokers, patients)
?Output:
???? Chi-squared Test for Trend inProportions
?data:??smokers out of patients ,
using scores: 1 2 3 4
X-squared = 8.2249, df = 1, p-value = 0.004132
?# trend test for proportions indicates proportions aretrending.
?How does one identify the direction of trending?
?# prop.test indicates that the proportions are unequal but doeslittle to indicate trend direction.
All the best,
Thomas Subia