| abind | Bind comformable arrays | 
| acond | Transform a frequency table into relative frequencies... | 
| atotal | Add all marginal sums to an array | 
| capply | Apply a function within each cluster of multilevel data | 
| constant | Generic test for constant | 
| cvar | Create a contextual variable for regression | 
| dropLast | Drop last facet of array | 
| dropLastTotal | Drop last elements of an array if it is a "Total" | 
| est | Estimates and SEs from a sample | 
| HTwts | Horvitz-Thompson and related weights | 
| jk_wtd_means | Post-stratification jacknife estimates of standard error | 
| jk_wtd_mean_se | Post-stratification jacknife estimate of SE of weighted mean | 
| lin_comb | Linear combination of x | 
| na20 | Transform NAs to 0 | 
| na.include | na.include action | 
| ns | Sample and population strata counts | 
| popagetable | Population table (IN PROGRESS) | 
| sam | Sample from a sampling frame | 
| survey | Functions for post-stratification adjustments in surveys | 
| tab | Table of frequencies or relative frequencies bordered with... | 
| tab_ | tab without marginal totals | 
| tab_df | Return a table as as data frame | 
| tolong_2 | Long data set from wide data set | 
| towide | Wide data set from long data set | 
| up | Create a data frame at a higher level of aggregation | 
| up_apply | Apply a function to clusters of rows in a data frame | 
| varLevel | Identify level of aggregation at which a variable in... | 
| wtd_mean | Weighted mean | 
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