 Statistics Questions

Subject Mathematics Statistics-R Programming

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# 7
tbl <- table(CURSMOKE=d\$CURSMOKE,ANGINA=d\$ANGINA) # CURSMOKE will be rows, ANGINA will be columns
tbl
#             ANGINA
# CURSMOKE    0    1
#       0   1862   391
#       1   1847   334

# (b) and (c)
chisq.test(tbl, correct=F)
# Pearson's Chi-squared test
#
# data: tbl
# X-squared = 3.3738, df = 1, p-value = 0.06624

# (d)

install.packages("fmsb")
library(fmsb)
riskratio(Y=391,X=334,,m2=2253,m1=2181)
# Disease Nondisease Total
# Exposed       334       1847 2181
# Nonexposed    391       1862 2253
#
# Risk ratio estimate and its significance probability
#
# data: 334 391 2181 2253
# p-value = 0.06627
# 95 percent confidence interval:
#   0.7720333 1.0085895
# sample estimates:
#    0.8824198...

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