Differential Item Functioning By Language on the new PROMIS® Physical Functioning Items 2.0 for Adults

This repository contains all code and data to reproduce the analyses for the paper: Differential Item Functioning By Language on the New PROMIS® Physical Functioning Items 2.0 for Adults

We conducted a multiverse DIF analyses that contains 272 plausible DIF analyses within the lordif framework. We also provide a companion R package to facilitating similar sensitivity analyses: lordifMultiverse.

Structure and files:

• ao1_1_... contains exploratory data analysis.
• ao1_2_... contains code to run multiverse DIF analysis.
• ao1_3_... contains code to inspect DIF at the item and test level.
• ao1_4_... contains all information on individual DIF analysis steps within lordif.
• /data contains the data from the actual publication and pertubated item parameters as outlined by Maxwell Armand Mansolf.
• /R and /man contain all relevant functions used to conduct all analyses.