[R] quantmod getOptionChain Interpret List Label As Date

Hi R Helpers, Is it possible to interpret the top level of the list as a date after downloading all the option chain data for a ticker? For example, after I run aapl_total<-getOptionChain("AAPL", NULL) the top descriptor of the lists is a date (Mar.09.2018, Mar.23.2018, etc.). So if want

[R] Latent Class Analysis Prediction

Hi Everybody, If I build a latent class model using lca or flexmix, how can I use the result to score another set of data and get predictions for class membership for that other set of data? I don't see a predict. function for lca or flexmix. Help would be much appreciated. --John S