| coefPlot | Plot model coefficients in 'ggplot2' | 
| coeftestCluster | Cluster standard errors on one or two variables | 
| dataAsList | Function to convert dataframe into list organized by grouping... | 
| generateSeries | Expand interval dataframe into series | 
| plotGroupedNA | Plot missing values grouped by a variable | 
| plotNA | Plot missing values | 
| theme_GS | Custom ggplot theme using minimal elements | 
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