Generic RMSEA function
See RMSEA.MxModel() to access the RMSEA of MxModels
RMSEA(x, ci.lower, ci.upper, digits)
| x | an object from which to get the RMSEA | 
| ci.lower | the lower CI to compute | 
| ci.upper | the upper CI to compute | 
| digits | digits to show | 
RMSEA object containing value (and perhaps a CI)
Other Reporting functions: 
RMSEA.MxModel(),
RMSEA.summary.mxmodel(),
extractAIC.MxModel(),
loadings(),
residuals.MxModel(),
tmx_show.MxMatrix(),
tmx_show(),
umxCI_boot(),
umxCI(),
umxConfint(),
umxExpCov(),
umxExpMeans(),
umxFitIndices(),
umxRotate()
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