dolution
dolution.
Open the MDS data-set
a. Run the MDS UNFOLDING program (as in this chapter’s example) using the following assumptions (OPTIONS menu):
i. Identity scaling model
ii. Proximities are dissimilarities
iii. No transformation of proximities
iv. No intercept
v. ‘Correspondence’ initial configuration
vi. Strength of penalty term: 0.3
vii. Range of penalty term: 2.0
b. Look at the output and comment on the results, comparing them with the ones in the chapter’s example
c. Change the following options:
• Ordinal transformation of proximities
• Include an intercept
• ‘Ross-Cliff’ initial configuration
• Strength of penalty 0.1
• Range of penalty term 1.0
d. Compare the results with the previous ones. Try changing the options one by one to see which one has the largest impact on the results
e. Save the final co-ordinates in a separate file and compute the correlations with the expert panel evaluations