umx_is_MxData(mtcars)
umx_is_MxData(mxData(mtcars, type= "raw"))
umx_is_MxData(mxData(cov(mtcars), type= "cov", numObs = 73))
umx_is_MxData(mxDataWLS(na.omit(twinData[, c("wt1", "wt2")]), type= "WLS"))
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