Hi Andy, I am going through the factor analysis tutorial and I thought I might write down some ideas/thoughts here for future reference, and we can discuss them someday and I'll make PRs for what you want☺️

discovr_18: EFA

• Unify correlation: Avoid swithing to psych by using the polychoric option incorrelation() + its plotting features
• sphericity and KMO: Useperformance::check_factorstructure() for a prettier check output ([Feature] improvement check_factorstructure easystats/performance#552)
• how many factors: reference (or use, but it might be overkill)n_factors()?
  • TODO for easystats: add plotting example that we have in thevignette + more details about each method)
• Use directlyparameters::factor_analysis()? tough benefits are probably small here
• Replacemodel_parameters() calls by aliasparameters() as it's a bit less confusing and simple

@strengejacke