PROsetta package provides functions formetric-linking of item parameters and producing crosswalk tables as usedin thePROsetta Stoneproject.
The primary aim of the PROsetta Stone project (1RC4CA157236-01, PI:David Cella) is to develop and apply methods to link thePatient-Reported Outcomes Measurement Information System (PROMIS)measures with other related “legacy” instruments to expand the range ofPRO assessment options within a common, standardized metric. The projectidentifies and applies appropriate linking methods that allow scores ona range of PRO instruments to be expressed as standardized T-scoremetrics linked to the PROMIS.
A common problem when using a variety of patient-reported outcomemeasures (PROs) for diverse populations and subgroups is establishingthe comparability of scales or units on which the outcomes are reported.The lack of comparability in metrics (e.g., raw summed scores vs. scaledscores) among different PROs poses practical challenges in measuring andcomparing effects across different studies.
Linking refers to establishing a relationship between scores on twodifferent measures that are not necessarily designed to have the samecontent or target population. When tests are built in such a way thatthey differ in content or difficulty, linking must be conducted in orderto establish a relationship between the test scores.
One technique, commonly referred to as equating, involves the processof converting the system of units of one measure to that of another.This process of deriving equivalent scores has been used successfully ineducational assessment to compare test scores obtained from parallel oralternate forms that measure the same characteristic with equalprecision.
Install the latest release from CRAN:
install.packages("PROsetta")The documentation is available at (https://choi-phd.github.io/PROsetta/)