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...subset (nhis, xsmoke=='Never SMK'), breaks=MyBreaks, ylim = c(0,0.040), main= " ", col="green", xlab="Never Smoker's Age") lines (svysmooth(~age_p, bandwidth=5,subset(nhis, xsmoke=='Never SMK')), lwd=2) #Chart 4 svyboxplot (age_p~xsmoke, subset (nhis, age_p>=0), col=c("red", "yellow", "green"), medcol="blue", varwidth=TRUE, all.outliers=TRUE, ylab="Age at Interview", xlab=" " )

Sorry for the lack of reproducible data, but this seems to be a problem inherent to my dataset and I can't figure out where the issue is. I have several data frames set up as a time series with identical POSIXct date formats. If I keep the original data in data frame format and merge them using base merge- everything is perfect and everyone is happy. If I transform the data frames to zoo