# percentiles

### Creating Graphs in Stata: From Percentiles to Observe Trends (Part 2)

September 23rd, 2016 by

In a previous post we discussed the difficulties of spotting meaningful information when we work with a large panel data set.

Observing the data collapsed into groups, such as quartiles or deciles, is one approach to tackling this challenging task.  We showed how this can be easily done in Stata using just 10 lines of code.

As promised, we will now show you how to graph the collapsed data. (more…)

### Converting Panel Data into Percentiles to Observe Trends in Stata (Part 1)

September 20th, 2016 by

Panel data provides us with observations over several time periods per subject. In this first of two blog posts, I’ll walk you through the process. (Stick with me here. In Part 2, I’ll show you the graph, I promise.)

The challenge is that some of these data sets are massive. For example, if we’ve collected data on 100,000 individuals over 15 time periods, then that means we have 1.5 million cells of information.

So how can we look through this massive amount of data and observe trends over the time periods that we have tracked? (more…)

### Member Training: Analysis of Ordinal Variables–Options Beyond Nonparametrics

January 5th, 2016 by

There are many types and examples of ordinal variables: percentiles, ranks, likert scale items, to name a few.

These are especially hard to know how to analyze–some people treat them as numerical, others emphatically say not to.  Everyone agrees nonparametric tests work, but these are limited to testing only simple hypotheses and designs.  So what do you do if you want to test something more elaborate?

In this webinar we’re going to lay out all the options and when each is (more…)