Each of these is a latent variable, which is measured by one or more observable variables.
Source: wiktionary
Latent variable
Synonyms for "latent variable" (10 found)
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Sample sentences
3 total sentences available.
2002, Cavid J. Bartholomew, 1: Old and New Approaches to Latent Variable Modelling, George A. Marcoulides, Irini Moustaki (editors), Latent Variable and Latent Structure Models, 2012, page 1, The earliest use of latent variable ideas in time series appears to have been due to Wiggins (1973) but, as so often happens, it was not followed up. […] The basis for this remark can be explained by reference to a simple example which, at first sight, appears to have little to do with latent variables.
Source: wiktionary
As stated earlier, in addition to having df greater than 0, the second condition for model identification is that the latent variables have to be scaled.
Source: wiktionary