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Final Assignment Measurement Theory & Assessment II Year 2.2 Psychology $6.18
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  5. Measurement Theory & Assessment II (P_BMETDIA_2)

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Final Assignment Measurement Theory & Assessment II Year 2.2 Psychology

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 23 purchases
  • Module
  • Measurement Theory & Assessment II (P_BMETDIA_2)
  • Institution
  • Vrije Universiteit Amsterdam (VU)

This is the final assignment for the course Measurement Theory & Assessment II of the second year of psychology. I received a 9.2 for this assignment. You will find the rubrics in the back of this document so you can see how this assignment has been graded exactly which may help you improve your ow...

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Document information

  • January 28, 2021
  • 10
  • 2020/2021
  • Essay
  • Unknown
  • 9-10

Subjects

  • measurement
  • theory
  • assessment
  • psychology
  • vrije
  • universiteit
  • amsterdam
  • gared
  • factor
  • analysis
  • logistic
  • regression
  • disorder
  • ii
  • 2
  • vu

Written for

  • Vrije Universiteit Amsterdam (VU)
  • Psychologie
  • Measurement Theory & Assessment II (P_BMETDIA_2)
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Running head: A PSYCHOMETRIC ANALYSIS OF THE GARED TEST 1




A Psychometric Analysis of the GARED Test

Mandy Roosendaal, 2663488

Measurement Theory & Assessment II

Diana Lucía Gross, Group 9

Word count: 1551

20-12-2020

, A PSYCHOMETRIC ANALYSIS OF THE GARED TEST 2


A Psychometric Analysis of the GARED Test

The Girls At Risk of Eating Disorders (GARED) study aimed to develop an online

screening instrument to help identify girls who are at risk of developing an eating disorder. From

this study, the GARED test resulted. This test contains 15 items with a 5-point response scale in

which participants indicate whether the item applies to them. For this report, a psychometric

analysis of the GARED test is carried out in the Statistical Package for the Social Sciences

(SPSS).

An important aspect of online testing is that the test must be short. With 15 items, the test

is currently too long. Therefore, the first aim of this analysis is to remove five items from the

test. To determine which five items of the test are least useful in predicting the risk of developing

an eating disorder, and are thus best suited for removal, a factor analysis is carried out in SPSS

which reveals the communalities of all items. Communalities indicate the amount of variance in

the item that is explained by the risk of developing an eating disorder. The items with the lowest

communalities are thus least related to the risk of developing an eating disorder and, therefore,

the five items with the lowest communalities are removed from the test.

The second aim of this psychometric analysis is to determine the test’s dimensionality. By

means of a factor analysis of the ten remaining items, it will be determined whether the items are

all dependent on the same latent variable. If this is the case, the test is unidimensional, and the

responses to the items all depend on the risk of developing an eating disorder. If not, the test is

multidimensional, and the responses to the items depend not only on the risk of developing an

eating disorder but also on another latent variable.

The third and final aim of this analysis is to determine whether the GARED test scores

are predictive of the risk of developing an eating disorder. A logistic regression analysis is carried

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