Part 6: Office Hours Part Two

Overview

Teaching: 60 min
Exercises: 35 min

Questions

• Can I apply anything I’ve learned today to new data?

Objectives

• Read in the data

• Select the Listening Test items

• Describe the distribution of total scores

• Provide an estimate of CTT reliability

• Conduct a Rasch analysis of the Listening Test data

• Summarize the Person and Item measurement facets (i.e., average ability/difficulty, SE)

• Calculate Person Separation

• Produce a Wright Person-Item map

• Produce Rasch item statistics in a table

• Include all of the above in a technical report in PDF format

Day 2 Problem Set

HINT: You can start working in a standard R script. Then, once your analyses and plots look fine, start a new R Notebook and begin laying things out - you can copy your code from the script and place it in chunks in your R Notebook. Or you can read it into your .Rmd document at the top using source and then call on the objects you want to print in your chunks.

You can download a prepped document or start your own.

download.file("https://raw.githubusercontent.com/gtlaflair/ltrc-2019/gh-pages/documents/listening-test-analysis.Rmd",
              "documents/listening-test-analysis.Rmd", mode = "wb")

You can download our answers here.

download.file("https://raw.githubusercontent.com/gtlaflair/ltrc-2019/gh-pages/scripts/day-2-problem-set-solution.R",
              "scripts/day-2-problem-set-solution.R", mode = "wb")

Key Points

• You can apply stuff that you learned today!