The data set is from a case-control study of smoking and Alzheimer’s disease. The data set has two variables of main interest:
smokinga factor with four levels “None”, “<10”, “10-20”, and “>20” (cigarettes per day)
diseasea factor with three levels “Alzheimer”, “Other dementias”, and “Other diagnoses”.
People that are not smoking cigarettes have the largest group. 0 cigarettes per day.
Other dimentias greater than 20 cigarettes a day.
Smoking does not matter in determining dementias. There is only small reltionships.
RailTrail data set is from the
mosaicData package. ``
Fall(-.25), Spring (-.04), Cloudcover(-.37), Percipitation (-.23) all have a negative correlation. ## Q6 What season seems to be least popular for trail users? Fall is the least popular season for trail users. ## Q7 The correlation coefficient between
cloudcover is quite small. Would you be sure that the two variables are not related at all? Hint: One word answer (e.g., yes or no) is NOT enough. Explain why.
No, the correlation between high temp and cloud coverage is very small. The correlation is (-0.1)
results in the chunk options. Refer to the RMarkdown Reference Guide.