for
while
if
else if
else
ifelse()
switch()
%>%
select()
summarise()
group_by()
mutate()
fct_relevel()
fct_recode()
fct_rev()
fct_infreq()
fct_inorder()
fct_shift()
fct_shuffle()
fct_reorder()
fct_reorder2()
fct_collapse()
fct_drop()
fct_expand()
fct_explicit_na()
ggsave()
quartz()
labs()
coord_*()
scale_*_*()
color
alpha
size
shape
linetype
theme_*()
theme()
*apply()
map_*()
split()
nest()
sample()
{rvest}の使い方?