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We describe a nonlinear generalization of factor analysis , called `` product analy-sis '' , that models the observed variables as a linear combination of products of normally distributed hidden variables .
 nonlinear generalization of factor analysis, observed variables; `` product analy-sis '', nonlinear generalization of factor analysis; linear combination of products of normally distributed hidden variables, nonlinear generalization of factor analysis
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Answer:
 nonlinear generalization of factor analysis, observed variables; `` product analy-sis '', nonlinear generalization of factor analysis; linear combination of products of normally distributed hidden variables, nonlinear generalization of factor analysis