Jun 7, 2015 8:22 AM
| Last Modified: Oct 18, 2016 4:27 PM
CI for Quantile.jsl
Sometimes you want to determine the quintile for a population, such as the median (0.5 or 50% quantile). You might also want the interval estimate. This script will compute the point estimate and the interval estimate for you.
I will use the Big Class data table to demonstrate how to use this script. I will first estimate the 95% confidence interval for the median of the height of students and then estimate the 80% confidence interval for the 75% percentile of the weight of students.
Open your data table with the data column containing the sample.
Open and run the script.
I desire a 95% confidence interval for the median, so enter 0.5 for the quantile (default) and 0.95 for the confidence (default).
Select height and click Response.
You see the additional information at the bottom of the platform. Note that the actual confidence is reported with the interval.
Repeating this demonstration for the other case,
Run the script.
Enter 0.75 for the quantile and 0.8 for the confidence.