Skip to content Skip to navigation Skip to collection information

OpenStax-CNX

You are here: Home » Content » Calculating Advanced Statistics » 6. Internal Consistency Analysis: Part I

Navigation

Lenses

What is a lens?

Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

This content is ...

In these lenses

  • Statistics

    This collection is included inLens: Mathieu Plourde's Lens
    By: Mathieu Plourde

    Click the "Statistics" link to see all content selected in this lens.

Recently Viewed

This feature requires Javascript to be enabled.
 

6. Internal Consistency Analysis: Part I

Module by: John R. Slate, Ana Rojas-LeBouef. E-mail the authors

ncpealogo.gif

Note:

This chapter is published by NCPEA Press and is presented as an NCPEA/Connexions publication "print on demand book." Each chapter has been peer-reviewed, accepted, and endorsed by the National Council of Professors of Educational Administration (NCPEA) as a significant contribution to the scholarship and practice of education administration.

About the Authors

  • John R. Slate is a Professor at Sam Houston State University where he teaches Basic and Advanced Statistics courses, as well as professional writing, to doctoral students in Educational Leadership and Counseling. His research interests lie in the use of educational databases, both state and national, to reform school practices. To date, he has chaired and/or served over 100 doctoral student dissertation committees. Recently, Dr. Slate created a website (Writing and Statistical Help) to assist students and faculty with both statistical assistance and in editing/writing their dissertations/theses and manuscripts.
  • Ana Rojas-LeBouef is a Literacy Specialist at the Reading Center at Sam Houston State University where she teaches developmental reading courses. Dr. LeBoeuf recently completed her doctoral degree in Reading, where she conducted a 16-year analysis of Texas statewide data regarding the achievement gap. Her research interests lie in examining the inequities in achievement among ethnic groups. Dr. Rojas-LeBouef also assists students and faculty in their writing and statistical needs on the Writing and Statistical Help website.

In this set of steps and screenshots, you will be presented with information regarding how to determine the internal consistency (i.e., reliability) of scores derived from a larger set of variables. In particular, this chapter follows up on the factor analysis chapter. The subscales that were determined to constitute Factor 1 and the subscales that were determined to comprise Factor 2 will be the variables used in this chapter to ascertain the extent to which they constitute internally consistent factors. For more detailed information regarding internal consistency analysis, readers are referred to the Hyperstats Online Statistics Textbook at http://davidmlane.com/hyperstat/ ; to the Electronic Statistics Textbook (2011) at http://www.statsoft.com/textbook/ ; or to Andy Field’s (2009) Discovering Statistics Using SPSS at http://www.amazon.com/Discovering-Statistics-Introducing-Statistical-Method/dp/1847879071/ref=sr_1_1?s=books&ie=UTF8&qid=1304967862&sr=1-1

Conducting an internal consistency analysis is usually part of a set of statistical analyses. Its purpose is to determine score reliability and not to determine whether groups differ on some variable. As such, internal consistency analysis precedes the use of inferential statistical procedures.

Have your data set pulled into SPSS-PC. In this data set, we have the same 10 subscales used in the factor analysis chapter.

5.1.png

Click on Analyze

Click on Scale

Click on Reliability Analysis

5.2.png

Using the information from the chapter on factor analysis, we want to determ ine the internal consistency of: Verbal 1 (Information), Verbal 2 (Similarities), Verbal 3 (Arithmetic), Verbal 4 (Vocabulary), and Verbal 5 (Comprehension). Click on each of these variables and send each to the box labeled Items.

5.3.png

Now your screen should look like the one below.

Click on Statistics.

5.4.png

After clicking on Statistics, the following screen should appear.

5.5.png

Click under Descriptives on

Item

Scale

Scale if item deleted

5.6.png

After you have clicked on the three items under Descriptives, next click under Summaries on

Means

Variances

5.7.png

Now that you have clicked on Means and Variances under Summaries, your screen should now look like the screen below. Next, under Inter-Item, click on

Correlations

5.8.png

After you check to verify that your screen looks the one below, then you may click on Continue.

5.9.png

Next click on OK.

5.10.png

SPSS should send you to the Output screen. If not, click on the Output icon at the bottom of your screen.

5.11.png

Collection Navigation

Content actions

Download:

Collection as:

PDF | EPUB (?)

What is an EPUB file?

EPUB is an electronic book format that can be read on a variety of mobile devices.

Downloading to a reading device

For detailed instructions on how to download this content's EPUB to your specific device, click the "(?)" link.

| More downloads ...

Module as:

PDF | More downloads ...

Add:

Collection to:

My Favorites (?)

'My Favorites' is a special kind of lens which you can use to bookmark modules and collections. 'My Favorites' can only be seen by you, and collections saved in 'My Favorites' can remember the last module you were on. You need an account to use 'My Favorites'.

| A lens I own (?)

Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

| External bookmarks

Module to:

My Favorites (?)

'My Favorites' is a special kind of lens which you can use to bookmark modules and collections. 'My Favorites' can only be seen by you, and collections saved in 'My Favorites' can remember the last module you were on. You need an account to use 'My Favorites'.

| A lens I own (?)

Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

| External bookmarks