Snoring versus heart disease

Data for Exercise 8.21

Snore

Format

A data frame/tibble with 2,484 observations on two variables

snore

factor with levels nonsnorer, ocassional snorer, nearly every night, and snores every night

heartdisease

factor indicating whether the indiviudal has heart disease (no or yes)

Source

Norton, P. and Dunn, E. (1985), Snoring as a Risk Factor for Disease, British Medical Journal, 291, 630-632.

References

Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.

Examples

T1 <- xtabs(~ heartdisease + snore, data = Snore)
T1
#>             snore
#> heartdisease nonsnorer occassional snorer nearly every night snores every night
#>          yes        24                 35                 21                 30
#>          no       1355                603                192                224
chisq.test(T1)
#> 
#> 	Pearson's Chi-squared test
#> 
#> data:  T1
#> X-squared = 72.782, df = 3, p-value = 1.082e-15
#> 
rm(T1)