3. Previously in this group
n Introduction
n Reading Data into R (1)
n Reading Data into R (2)
n Descriptive, continuous
n Descriptive, categorical
Group Website: http://rpubs.com/kaz_yos/useR_at_HSPH
4. Menu
n Groupwise comparison of continuous
variables
5. Ingredients
Statistics Programming
n one group vs null hypothesis n Creating a new variable
n two group comparison n t.test()
n multi-group comparison n wilcox.test()
n Distribution-free alternative n anova(lm())
for each
n kruskal.test()
n BSDA::SIGN.test()
8. Download comma-separated and Excel
Put them in folder
BONEDEN.DAT.txt
BETACAR.DAT.txt
http://www.cengage.com/cgi-wadsworth/course_products_wp.pl?
fid=M20bI&product_isbn_issn=9780538733496
10. Indexing: extraction of data from
data frame
Extract 1st to 15th rows Extract 1st to 12th columns
bone[1:15 , 1:12]
Colon in between
Don’t forget comma