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The effects of verbal and/or numerical labeling and number of categories on   the measurement of latent variables in web surveys are addressed. Data were   collected online in a quota sample of the German adult population (N = 741).   A randomized 2x2x2 experimental design was applied, with variation of the   number of categories, as well as of verbal and numerical labeling, using an   abbreviated version of the Positive and Negative Affect Schedule (PANAS).   Experimental manipulation of the rating scale formats resulted in an effect   on measurement model testing and reliability, as well as on factorial and   convergent validity. In addition, measurement invariance between several   rating scale formats was limited. With the five category end verbalized and   fully labeled seven category formats, acceptable results for all measurement   quality metrics could be obtained

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The impact of frequency rating scale formats on the measurement of latent variables in web surveys - an experimental investigation using a measure of affectivity as an example