I collected data through questionnaires (likert scales). Unfortunedly missing values occured. I tried to replace them with the EM inputation function available in SPSS and some of the estimated values were outside the scale (e.g. a "0" or a "-1"; 1-7 possible). Is that normal or do I have to do some adjustments in before?
Thank you very much for your help!
Dear Said Tifaoui
,first of all thank you very much for your quick response.
Does that mean that the EM function is generally not suitable for data produced by likert scales, since the system does not know the boundaries of the scale? I did some research about inputation in advance and I am aware that multiple inputation is probably state of the art and that all inputation methods have their weaknesses. But as far as I know psychologists also use this EM function to replace their missing date on likert scaled items.
Kind regards.
Tobias
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