hist(vector,
breaks=seq(from=min,to=max,by=step)
axes=FALSE,
main="Title"
xlab="Label of X Axis"
)
axis(1, seq(from=min,to=max,by=step))
Note that you want to use different sequences for the breaks and
the axis. In some models (such as that used in our book), the breaks
usually come between values, which means it will be helpful if they
have a fractional component. In contrast, you want the tick marks to
be in the middle of each bar. For example, if we wanted to deal with
values between 0 and 100, grouped into sections of 5, we might use
hist(vector,
breaks=seq(from=-2.5,to=102.5,by=5),
axes=FALSE,
main="Title"
xlab="Label of X Axis"
)
axis(1, seq(from=0,to=100,by=5))
Histograms provide a visual way to summarize data in cases in
which you want to group nearby values. In many ways, they resemble
dot plots, but they use broader categories for the dots.
You make histograms with the hist function>.
It takes as its primary parameter a vector of values. (As is the
case with dotplots, the hist function will tally
the values for you.)
hist(vector)
If you give R no other information on the histogram, it chooses the
breaks for you. Most of the time, you want to choose the breaks
yourself.
