Merge pull request #141 from Crunch-io/issue_104

Updating FAQ with sorting examples

vignettes/FAQ.Rmd

@@ -200,6 +200,31 @@ myTheme <- themeNew(
 writeExcel(ct_summary, filename = "output", theme = myTheme) 
 ```
 
+### How do I sort a categorical or multiple response question's presenation?
+
+You can sort response categories alphabetically or by proportion. You can apply a fixed presentation order and you can pin response categories to the top or bottom. 
+
+```{r, eval = FALSE}
+ds = loadDataset("Example dataset")
+# Use ds = newExampleDataset() if it doesn't work
+ct = crosstabs(ds)
+ct = sortAliases(ct)
+
+writeLatex(ct, ...)
+```
+
+The default behaviour sorts all questions that can be sorted, descending by order of proportion. But we can apply a variety of different sorting options by using the `sortAliases` function repeatedly. 
+
+```{r, eval = FALSE}
+# load ds, define theme ...
+
+ct = sortAliases(ct, var = c("a", "b"), alpha = TRUE) # sort a/b by alpha
+ct = sortAliases(ct, var = "c") # sort c by numeric
+ct = sortAliases(ct, var = "d", pin_to_bottom = "Don't know")
+
+writeLatex(ct, ...)
+```
+
 ### How do I request a new feature? 
 
 We welcome features requests as new issues to the [crunchtabs github repository](https://github.com/Crunch-io/crunchtabs/issues)