Is it necessary to test the significance of marker indicator in SEM?
I have a SEM model in which latents have two indicators. I estimated hybrid model using one step approach. When I release constraint one maker indicator (I mean I changed the marker variable) the marker variable has a sign contradictory with theoretical expectations(by the way it is statistically significant)? Is it a problem? If I do not release the marker indicator and do not test if it is significant and in harmony with theoretical expectations, is it ethical?
Read this paper:
Article Should researchers use single indicators, best indicators, o...
I also recommend this book:
http://psycnet.apa.org/record/1996-97476-000
Your "marker indicador" should be your "gold standard" indicator, which is based on your theory. If you change your gold standard indicador maybe your are changing your theory. Fix the gold standard to 1 (if appropiate) and fix its error variance (reliability).
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