LNM.EM: LNM.EM
In bryandmartin/MicrobiomePack: Tools for Microbiome data analysis

This function estimates the LNM model fit from Xia et al.

1 2	LNM.EM(W, X, base, EMiter = 10, EMburn = 5, MCiter = 1000, MCburn = 500, stepsize = 0.01, p = 0.05, poorman = FALSE)

`W`	count matrix, with OTUs as columns
`X`	covariate matrix
`base`	OTU index to be used for base
`EMiter`	number of EM iterations, defaults to 10
`EMburn`	number of EM iterations to burn, defaults to 5
`MCiter`	number MC iterations, defaults to 1000
`MCburn`	number of MC iterations to burn, defaults to 500
`stepsize`	variance used for MH samples, defaults to 0.01. Tweak to adjust acceptance ratio
`p`	size of purturbation used for logratios, defaults to 0.05
`poorman`	boolean of whether to just use simple diagonal inverse to calculate sigma inverse. Defaults to FALSE