What's the procedure to do multidimensional scaling in spss, and in which case shall I do it?
From the menus of SPSS choose:
Analyze Scale Multidimensional Scaling…
In Distances, select either Data are distances or Create distances from data.
If your data are distances, you must select at least four numeric variables for analysis, and you can click Shape to indicate the shape of the distance matrix.
If you want SPSS to create the distances before analyzing them, you must select at least one numeric variable, and you can click Measure to specify the type of distance measure you want. You can create separate matrices for each category of a grouping variable (which can be either numeric or string) by moving that variable into the Individual Matrices For list.
Do you mean how to have a plot that has more than 2 dimensions\scales?
From the menus of SPSS choose:
Analyze Scale Multidimensional Scaling…
In Distances, select either Data are distances or Create distances from data.
If your data are distances, you must select at least four numeric variables for analysis, and you can click Shape to indicate the shape of the distance matrix.
If you want SPSS to create the distances before analyzing them, you must select at least one numeric variable, and you can click Measure to specify the type of distance measure you want. You can create separate matrices for each category of a grouping variable (which can be either numeric or string) by moving that variable into the Individual Matrices For list.
Also, in SPSS menus you can use the help, Topics , Index or contents And then type Multidimensional Scaling
Hi Mahmoud
This free pre-edit document can help you step-by-step to create multidimensional scale in SPSS. It's preliminary data analysis (PDA) .
https://www.researchgate.net/publication/262151892_Introduction_to_SPSS
Best wishes
Article Introduction to SPSS
It is important to remember that SPSS does not calculate tetrachoric or polychoric correlations. So, if your instrument has dichotomous, categorical or ordinal items, it cannot be done!
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