Creating Frequency Tables; Bar Graphs; and Pie Charts in StatCrunch Video

the purpose of this video is to give you
some idea of how to use statcrunch to
analyze variables that are nominal or
ordinal in nature one of the first
things you need to do is to log into
statcrunch using the ID that you created
and when you get there the home screen
will pretty much consistently look
something alike your statcrunch account
now one of the first things you could do
is you could open statcrunch and you'll
see a blank screen that looks similar to
an Excel worksheet now until we have
data in these columns we can't do much
with that now in our case the data sets
will be posted to the group that you
joined so if you go back to my
statcrunch you can click on my groups
and in your case you would be joined
into one of the two groups either
section 1 or section 2 depending upon
which one you are enrolled so let's look
at section 1 section 2 looks similar and
you can see that this group now has four
data sets that have been posted three
results and one report will discuss the
results in the reports in just a little
bit but for right now let's look at the
first data set that's mentioned in the
chapter 1 notes so what you had in the
chapter 1 notes was you had an example
that dealt with blood type for a random
sample of 50 adults and you see that you
have that data set in the last one in
your data set list so if you click on
the data set name that's going to open
that data in your statcrunch window and
you see that now your first column has
been filled in with the blood type from
the 50 people that were included in your
sample now the results that were
generated in the chapter 1 notes
document were threefold
first we created a frequency table and
that table just gave the count of how
many people were in each blood type and
also the relative frequency or
percentage of patients that fell in that
blood type to generate that to generate
those results in statcrunch you need to
go to the stat menu followed by tables
and we want to develop a frequency table
now statcrunch will always deal with
java pop-up windows and it's fairly
straightforward what it wants for you to
do so in this case we want to select the
column the variable we're interested in
is blood type
if you click Next you're given a couple
of options in forms in terms of how you
want to order your values and then you
can click calculate and you get a table
similar to the table that's posted in
the notes now at this point you have a
couple of options for what you can do if
you click the options button one option
you have is to export to my results now
if you were to do that the window that
pops up wants a title now when you give
these titles it's kind of important to
be somewhat descriptive otherwise it's
very easy to lose track of what results
go with what data set so if we were to
title this frequency table of blood type
you could export that to just your own
personal results so if I were to click
export you'll notice that now you have
my results for this data that's over
here on the right hand side the other
two graphical displays that were created
were a bar graph and a pie chart not
surprising those options can be found
under the graphics menu and your first
option is a bar plot and in our case
we're going to do this bar plot with
data again the first window that's going
to pop up ask you to select the column
that contains your data so we'll select
blood type
if you click Next you can choose to do a
frequency bars plot or you can do a
relative frequency bar plot the only
difference is the y axis scale if
frequencies selected your plot will show
the number of patients for each blood
type
if relative frequency selected it'll
show the percentage of patients in that
blood type
now the last box that we're gonna deal
with is if you click Next you get some
labels that you can add to your data set
so in our case our x-axis label is going
to be the blood type
so along our horizontal axis we'll have
the four blood types and since we
selected frequency along our y-axis
we'll have the frequency of occurrence
the other option that you need to add is
you need to have some type of a
descriptive title for any graph that you
create so in our case we have a bar
graph for the blood type of 50 patients
and then in the lower right hand corner
if you click create graph you'll see a
bar graph similar to the one that was
posted in the notes on blackboard again
the options button is available you can
export that to your results and I'll
show you a little bit more later on the
flexibility that statcrunch will give
you in terms of using this now the final
graph that was created was a pie chart
and again that's going to be under your
graphics menu and we are doing this one
with data also similar to the other
structure you select the column by
clicking on it that you'd like to create
a chart for click Next again some
options that you have one more time
gives you an option to create a title on
your graph and you can click create
graph again and you have the pie chart
that's given in the notes so for the
most part statcrunch is fairly easy to
use remember your data sets will be
posted within the group that you've
joined to open the data set you simply
need to click on the link that's there
and then for the most part the analyses
that we'll perform are under the stat
menu and under the graphics menu