r - lrm function from rms package does not function -

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i need cluster standard errors dyads, , trying use rms package. need fit model using lrm instrad of glm. when type library(rms) following error:

error in loadnamespace(i, c(lib.loc, .libpaths()), versioncheck = vi[[i]]) :    there no package called ‘mvtnorm’ error: package or namespace load failed ‘rms’,

and when try use following comand cluster standard errors dyads error function lrm not exist. 

fit=lrm(disease ~ age + study + rcs(bmi,3), x=t, y=t, data=dataf) fit robcov(fit, cluster=dataf$id) bootcov(fit,cluster=dataf$id)

and know x=t , y=t are? have started working in r , statistics in general, none of quite obvious me.


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