Psychometric considerations of the mmpi 2
Download
1 / 44

Psychometric Considerations of the MMPI-2 - PowerPoint PPT Presentation


  • 589 Views
  • Updated On :

Psychometric Considerations of the MMPI-2. William P. Wattles, Ph.D. Francis Marion University. MMPI/MMPI-2 second most widely used test by clincical psychologists (86%) Translated into more than 50 languages. Original MMPI. Published 1943

Related searches for Psychometric Considerations of the MMPI-2

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Psychometric Considerations of the MMPI-2' - kamal


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Psychometric considerations of the mmpi 2 l.jpg

Psychometric Considerations of the MMPI-2

William P. Wattles, Ph.D.

Francis Marion University


Slide2 l.jpg


Original mmpi l.jpg
Original MMPI psychologists (86%)

  • Published 1943

  • Paper and pencil improvement on clinical interview and individual psychological testing


Prior to mmpi logical keying l.jpg
Prior to MMPI: Logical Keying psychologists (86%)

  • Test items generated rationally based on:

    • Face validity

    • Subjective judgment

  • Logically keyed items problematic:

    • Subject to faking

    • Not always correct


Face validity l.jpg
Face Validity psychologists (86%)

  • Does the test appear to measure what it is purported to Measure?


Face validity6 l.jpg
Face Validity psychologists (86%)

0 I do not feel sad.

1 I feel sad.

2 I am sad all the time and can't snap out of it.

3 I am so sad or unhappy that I can't stand it.


Slide7 l.jpg

  • 70. I am easily downed in an argument psychologists (86%)

  • 89 My hardest values are with myself

  • 267 I have periods in which I feel unusually cheerful without any special reason.

  • 219 I have been disappointed in love


Empirical keying l.jpg
Empirical Keying psychologists (86%)

  • Original items came from many sources.

  • Pool of 1,000 items reduced to 566

  • Rewritten to be less formal and allow for some reversal of responses.


Control group l.jpg
Control Group psychologists (86%)

  • 724 Visitors to the hospital in Minnesota.

  • Representative of Minnesota in the 1930s

    • 16-65

    • Average age mind 30’s

    • Rural

    • 8th grade education

    • White


Empirical keying10 l.jpg
Empirical Keying psychologists (86%)

  • Using groups of diagnosed patients

  • Contrast and Cross-validation


Mmpi vs mmpi 2 l.jpg
MMPI vs MMPI 2 psychologists (86%)

  • Improved norms

  • Score has meaning only when compared to a representative sample.

  • Original sample Caucasian, 35, married, small town, good job.

  • New sample large and more representative.

  • Higher education level than population


Mmpi 2 normative group l.jpg
MMPI-2 normative group psychologists (86%)

  • 2600 Participants

  • Paid $15 ($40 for couples)

  • Tested in 7 locations

    • Minnesota, Ohio, North Carolina, Washington, Pennsylvania, Virginia, California

  • Selected from phone directories


Mmpi 2 composition l.jpg
MMPI-2 composition psychologists (86%)

  • 2600 Participants (started with 2900)

    • 1138 men

    • 1462 women

  • Age 18-85 (M=41, SD=15)

  • 61% married

  • Education 3-20 years (M=14, SD=2)


Mmpi 2 restandardization l.jpg
MMPI-2 Restandardization psychologists (86%)

  • Caucasian 81%

  • African-American 12%

  • Hispanic 3%

  • Native-American 3%

  • Asian-American 1%


Requirements l.jpg
Requirements psychologists (86%)

  • Eight Grade reading level required

  • Satisfactory cooperation and commitment to task

  • Internal checks for the above


T score transformations l.jpg
T Score transformations psychologists (86%)

  • Transforming a score makes it easier to interpret.

  • 13 validity and clinical scales converted to T scores

  • T score is a standard score with a mean of 50 and a standard deviation of 10.

  • Thus, a 70 is like a Z score of 2


Standard scores or z scores l.jpg
Standard Scores or Z scores psychologists (86%)

  • Z score: how many standard deviations a score lies above or below the mean.


Slide18 l.jpg

68% psychologists (86%)

95%

99.7%

46


Percent of scores falling below l.jpg
Percent of scores falling below psychologists (86%)


Slide20 l.jpg

99.85% psychologists (86%)

97.5%

84%

46


Z score l.jpg
Z-score psychologists (86%)

33


Mmpi 2 t score l.jpg
MMPI-2 T score psychologists (86%)

33


Mmpi uniform t score l.jpg

Original linear T-scores were problematic because the underlying data is somewhat skewed.

Thus a T score on one scale represented a different percentile than one on another scale

MMPI Uniform T score


Mmpi uniform t scores l.jpg

Involve averaging of the T-scores across the scales. underlying data is somewhat skewed.

MMPI Uniform T-scores


Frequency high points in contemporary settings l.jpg
Frequency high points in contemporary settings underlying data is somewhat skewed.


T score cutoff l.jpg
T-score cutoff underlying data is somewhat skewed.

  • Formerly T-scores of 70 were considered clinically significant. Now the MMPI-2 recommends 65.

  • That puts the score above 93% of those who answer

    • 65-50/10 = 1.5

    • 1.5 = .9332 area under standard normal curve to the left of Z = 1.5


Intercorrelations l.jpg
Intercorrelations underlying data is somewhat skewed.

  • There is considerable overlap between some scales. 13 of 39 items in scale 6 also appear in scale 8


Homogeneity of items l.jpg
Homogeneity of items underlying data is somewhat skewed.

  • The empirical keying approach did not favor item homogeneity thus internal consistency is not high.


Temporal stability l.jpg
Temporal Stability underlying data is somewhat skewed.

  • Ability, interest and aptitude tests should be high in temporal stability

  • Personality and psychopathology measures less clear.


Test retest reliability one week l.jpg
Test-retest reliability one week underlying data is somewhat skewed.


Test retest reliability l.jpg
Test-retest reliability underlying data is somewhat skewed.

  • Summary. Test is fairly stable and changes when current appear consistent. Significant changes generally correctly reflect behavior change.


Internal consistency l.jpg
Internal consistency underlying data is somewhat skewed.

  • Moderate, not a strength for the MMPI-2 due to empirical keying approach.


Factor analysis l.jpg
Factor Analysis underlying data is somewhat skewed.

  • Two strong factors identified

    • General maladjustment and psychotic thought

    • Neurotic characteristics


Response sets and styles l.jpg
Response sets and styles underlying data is somewhat skewed.

  • Charges that MMPI and MMPI-2 were confounded by response style.

  • Block modified MMPI to have equal number of true and false items

  • Test seems to be valid in a variety of settings.


Mmpi vs mmpi 235 l.jpg
MMPI vs MMPI-2 underlying data is somewhat skewed.

  • Validity similar

  • Raw Scores higher on MMPI-2

    • May be explained by instructions

  • T-scores compensate for higher raw scores


Items changed mmpi 2 l.jpg
Items changed MMPI-2 underlying data is somewhat skewed.


Basic qualifications for users l.jpg
Basic Qualifications for users underlying data is somewhat skewed.

  • Graduate-level course in psychological testing.

    • Standard scores

    • Transformations

    • Understand limits of accuracy

    • Standard error of measurement


Basic qualifications for users38 l.jpg
Basic Qualifications for users underlying data is somewhat skewed.

  • Graduate-level course in psychopathology

    • Personality structure

    • Dynamics

    • Deviance psychodiagnostic concepts

    • Diagnostic systems

    • Broad understanding of human personality


Lexile reading levels in sirs l.jpg
Lexile Reading Levels in SIRS underlying data is somewhat skewed.

Lexile Score Table from www.lexile.com:

What Are Lexile Reading Levels

  • Lexile scores match reader ability and text difficulty, allowing individualized monitoring of student progress.

  • Due to the accountability requirements of NCLB, many states are turning to standardized systems for reading which help to track student progress.

    How does it Work?

  • Lexile measures are based on two well-established predictors of how difficult a text is to comprehend: semantic difficulty (word frequency) and syntactic complexity (sentence length).


Reading level l.jpg
Reading Level underlying data is somewhat skewed.


Lexile examples l.jpg
Lexile examples underlying data is somewhat skewed.

  • 39 I am an important person

  • 294 I have not lived the right kind of life

  • 603 I do not read every editorial in the newspaper everyday

  • 860 Most anytime I would rather sit and daydream than do anything else.

  • 1042 I am troubled by discomfort in the pit of my stomach every few days or oftener.


Testing conditions l.jpg
Testing conditions underlying data is somewhat skewed.

  • Quiet room one setting preferred

  • Okay to take over several intervals

  • Person must have privacy and no help

  • Simple definitions of words permitted along with rephrasing of colloquialisms

  • Usually sufficient to say: “Just indicate the way you see it.”


Slide43 l.jpg


The end l.jpg
The End underlying data is somewhat skewed.

The End


ad