A quick search for: SAS "Proc LCA" finds several papers one, https://stats.idre.ucla.edu/sas/dae/latent-class-analysis/ has this line: Note:  This example is done in PROC LCA 1.3.2. PROC LCA is developed for SAS version 9.4 for Windows by the Methodology Center at Penn State. It can be downloaded from their website.   The Proc is not a SAS supplied or written procedure and hence is not part of SAS On Demand. ... View more