My psychology dissertation will be a cluster analysis with one grouping variable. How do I know how many participants I need? I imagine there should not be more than 5 clusters. 79 items make up 9 attributes that the participants will be clustered on. I realize that power analysis is moot since cluster analysis is not inferential. I have seen that for factor analysis it is 10 per item but cannot seem to find a guideline for cluster analysis.
Thanks for any help or insight you can offer.