Statistical test of significance - Please give R or SAS code. The left column is
ID: 3341253 • Letter: S
Question
Statistical test of significance - Please give R or SAS code.
The left column is the probability of contracting cancer, and the right column is the country, labeled countries 1-4. The right column is ordinal.
Do a test showing whether the probability differs amongst the four countries, or is the same. Thus, is there a difference in risk probability amongst countries, or is the probability about equal in all four countries. All possibly, test whether the variables are normal and homogenous.
Thank you
Risk Country 6.3 1 4.9 1 4.3 3 7.7 1 3.7 2 4.2 3 5.5 3 4.5 4 6.4 1 4.2 2Explanation / Answer
Result:
Statistical test of significance - Please give R or SAS code.
The left column is the probability of contracting cancer, and the right column is the country, labeled countries 1-4. The right column is ordinal.
Do a test showing whether the probability differs amongst the four countries, or is the same. Thus, is there a difference in risk probability amongst countries, or is the probability about equal in all four countries. All possibly, test whether the variables are normal and homogenous.
Kruskal-Wallis Test used
R code:
grp <- c(1,1,3,1,2,3,3,4,1,2)
y <- c(6.3,4.9,4.3,7.7,3.7,4.2,5.5,4.5,6.4,4.2)
grp<-factor(grp)
mydata <- data.frame(grp,y)
kruskal.test(y ~ grp, data = mydata)
R output:
Kruskal-Wallis rank sum test
data: y by grp
Kruskal-Wallis chi-squared = 6.7637, df = 3, p-value = 0.07982
P value is > 0.05 level. We conclude that there is no difference in risk probability amongst the four countries.
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