WEBVTT

00:00:00.000 --> 00:00:02.490 align:middle line:90%
[MUSIC PLAYING]

00:00:02.490 --> 00:00:15.950 align:middle line:90%


00:00:15.950 --> 00:00:17.720 align:middle line:84%
Hello, and welcome
to a quick tutorial

00:00:17.720 --> 00:00:21.155 align:middle line:84%
on how to calculate alpha
reliability using R Commander.

00:00:21.155 --> 00:00:25.340 align:middle line:84%
So let's go ahead and
type in library Rcmdr.

00:00:25.340 --> 00:00:27.650 align:middle line:84%
Make sure you capitalize
the R, or it's not

00:00:27.650 --> 00:00:29.630 align:middle line:90%
going to open for you.

00:00:29.630 --> 00:00:31.430 align:middle line:84%
Once R is open, we're
going to come up here

00:00:31.430 --> 00:00:36.267 align:middle line:84%
to Data, Import Data
from SPSS Data Set.

00:00:36.267 --> 00:00:38.600 align:middle line:84%
And then we're going to go
ahead and open the one that's

00:00:38.600 --> 00:00:41.090 align:middle line:84%
the full textbook
data set because it

00:00:41.090 --> 00:00:43.670 align:middle line:90%
has all those individual items.

00:00:43.670 --> 00:00:45.170 align:middle line:84%
Now, let's take
a second and look

00:00:45.170 --> 00:00:47.150 align:middle line:90%
at that data set real fast.

00:00:47.150 --> 00:00:50.180 align:middle line:84%
So when you look at it, for our
purposes, what we want to do

00:00:50.180 --> 00:00:54.470 align:middle line:84%
is we want to calculate
the alpha reliability

00:00:54.470 --> 00:00:56.402 align:middle line:90%
for the PRCA-24.

00:00:56.402 --> 00:00:58.790 align:middle line:84%
So I'm actually going to
scroll all the way out here,

00:00:58.790 --> 00:01:00.748 align:middle line:84%
and I'm going to make
this a little bit bigger,

00:01:00.748 --> 00:01:03.385 align:middle line:84%
so we can see all
24 of those items.

00:01:03.385 --> 00:01:05.120 align:middle line:90%
So all 24 here.

00:01:05.120 --> 00:01:08.390 align:middle line:84%
We have the prca1 all
the way to the prca24.

00:01:08.390 --> 00:01:10.610 align:middle line:84%
R is the measure
that is the Personal

00:01:10.610 --> 00:01:13.410 align:middle line:84%
Report for Communication
Apprehension 24.

00:01:13.410 --> 00:01:16.380 align:middle line:84%
So for our purposes, we want to
see what that alpha reliability

00:01:16.380 --> 00:01:17.210 align:middle line:90%
is for all of that.

00:01:17.210 --> 00:01:19.760 align:middle line:84%
So then, once we've looked at
that, I'm going to go ahead

00:01:19.760 --> 00:01:20.810 align:middle line:90%
and X out of that.

00:01:20.810 --> 00:01:22.950 align:middle line:84%
We're going to come back
down here to R Commander,

00:01:22.950 --> 00:01:24.650 align:middle line:84%
and we're going to
go to Statistics.

00:01:24.650 --> 00:01:27.500 align:middle line:84%
Now, it's a little
bit awkwardly placed

00:01:27.500 --> 00:01:29.815 align:middle line:84%
in R for where the alpha
reliability is, which

00:01:29.815 --> 00:01:31.190 align:middle line:84%
is one of those
things that we've

00:01:31.190 --> 00:01:33.482 align:middle line:84%
seen in a couple of
these different tests.

00:01:33.482 --> 00:01:34.940 align:middle line:84%
So let's go ahead
and look at that.

00:01:34.940 --> 00:01:36.314 align:middle line:84%
So we're going to
come down here.

00:01:36.314 --> 00:01:39.320 align:middle line:84%
We're going to scroll
down to this thing called

00:01:39.320 --> 00:01:41.030 align:middle line:90%
Dimension Analysis.

00:01:41.030 --> 00:01:43.646 align:middle line:84%
And the very first one is
going to be Scale Reliability.

00:01:43.646 --> 00:01:45.520 align:middle line:84%
So we're going to go
ahead and click on that.

00:01:45.520 --> 00:01:47.960 align:middle line:84%
Now, you're going to
see a pop-up menu.

00:01:47.960 --> 00:01:50.870 align:middle line:84%
And it's not a very big one,
which is kind of frustrating.

00:01:50.870 --> 00:01:53.390 align:middle line:84%
Again, notice that these
aren't listed in the same way

00:01:53.390 --> 00:01:55.745 align:middle line:84%
that they are in
the data set itself.

00:01:55.745 --> 00:01:57.200 align:middle line:90%
They've alphabetized them.

00:01:57.200 --> 00:02:01.830 align:middle line:84%
So we need to scroll down
and actually find the prca1.

00:02:01.830 --> 00:02:04.610 align:middle line:90%
And there it is-- prca1.

00:02:04.610 --> 00:02:07.771 align:middle line:84%
Lets us know that's the
first item for the PRCA-24.

00:02:07.771 --> 00:02:09.229 align:middle line:84%
And that's just
one of those things

00:02:09.229 --> 00:02:12.620 align:middle line:84%
that I know because we know
what this data set says in it.

00:02:12.620 --> 00:02:16.480 align:middle line:84%
So you do have to know your
data set to be able to do this.

00:02:16.480 --> 00:02:17.850 align:middle line:90%
So I've selected the first one.

00:02:17.850 --> 00:02:20.030 align:middle line:84%
What I'm going to do now
is I'm going to hold Shift,

00:02:20.030 --> 00:02:23.300 align:middle line:84%
and I'm going to come all
the way down to number 24.

00:02:23.300 --> 00:02:24.634 align:middle line:90%
So I'm holding Shift.

00:02:24.634 --> 00:02:26.300 align:middle line:84%
Then I'm going to
click on the last one.

00:02:26.300 --> 00:02:29.060 align:middle line:84%
That's going to
highlight all 24 items.

00:02:29.060 --> 00:02:31.617 align:middle line:84%
At that point, you can
go ahead and click OK.

00:02:31.617 --> 00:02:33.200 align:middle line:84%
So the first thing
you're going to see

00:02:33.200 --> 00:02:35.710 align:middle line:84%
is that it's going to addend
some information about it.

00:02:35.710 --> 00:02:38.150 align:middle line:84%
It gives you some information
about the reliability

00:02:38.150 --> 00:02:41.420 align:middle line:84%
for each of the different
items and how it contributes.

00:02:41.420 --> 00:02:44.970 align:middle line:84%
But what we want to see
is this row right here,

00:02:44.970 --> 00:02:47.230 align:middle line:90%
which is alpha reliability.

00:02:47.230 --> 00:02:48.750 align:middle line:84%
And you'll notice
that in this case,

00:02:48.750 --> 00:02:55.230 align:middle line:84%
alpha reliability is
that 0.9394, or 0.94.

00:02:55.230 --> 00:02:59.270 align:middle line:84%
And so that is all that it takes
to run an alpha reliability

00:02:59.270 --> 00:03:01.130 align:middle line:90%
using R Commander.

00:03:01.130 --> 00:03:04.180 align:middle line:90%
[MUSIC PLAYING]

00:03:04.180 --> 00:03:15.418 align:middle line:90%