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Factor analysis and principal components analysis can be used to model linear relationships between observed variables and linearly map high-dimensional data to a lower-dimensional hidden space .
 Factor analysis, principal components analysis; Factor analysis, linear relationships between observed variables; principal components analysis, linear relationships between observed variables
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 Factor analysis, principal components analysis; Factor analysis, linear relationships between observed variables; principal components analysis, linear relationships between observed variables