Partial least squares path modeling
The partial least squares path modeling or partial least squares structural equation modeling (PLS-PM, PLS-SEM) is a method of structural equation modeling which allows estimating complex cause-effect relationship models with latent variables.
PLS-PM is a component-based estimation approach that differs from the covariance-based structural equation modeling. Unlike covariance-based approaches to structural equation modeling, PLS-PM does not fit a common factor model to the data, it rather fits a composite model ; In doing so, it maximizes the amount of variance explained (though what this means from a statistical point of view is unclear and PLS users do not agree on how this goal might be achieved). In addition, by an adjustment PLS is capable to consistently estimate common factor models as well. This new approach is called consistent PLS (PLSc). Furthermore, PLS-PM can be used for out-sample prediction purposes and can be employed as an estimator in confirmatory composite analysis.
The PLS structural equation model is composed of two sub-models: the measurement model and structural model. The measurement model represents the relationships between the observed data and the latent variables. The structural model represents the relationships between the latent variables.
An iterative algorithm solves the structural equation model by estimating the latent variables by using the measurement and structural model in alternating steps, hence the procedure's name, partial. The measurement model estimates the latent variables as a weighted sum of its manifest variables. The structural model estimates the latent variables by means of simple or multiple linear regression between the latent variables estimated by the measurement model. This algorithm repeats itself until convergence is achieved.
With the availability of software applications, PLS-SEM became particularly popular in social sciences disciplines such as accounting, family business, marketing, management information systems, operations management, strategic management, and tourism. Recently, areas such as engineering, environmental sciences, medicine, and political sciences more broadly use PLS-SEM to estimate complex cause-effect relationship models with latent variables. Thereby, they analyse, explore and test their established and underlying their conceptual models and theory.
PLS is viewed critically by several methodological researchers. A major point of contention has been the claim that PLS can always be used with very small sample sizes. A recent study suggests that this claim is generally unjustified, and proposes two methods for minimum sample size estimation in PLS. Another point of contention is the ad hoc way in which PLS has been developed and the lack of analytic proofs to support its main feature: the sampling distribution of PLS weights. However, PLS-SEM is still considered preferable (over CB-SEM) when it is unknown whether the data's nature is common factor- or composite-based.
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