Generates all of the scores of the Functional Assessment of Cancer Therapy-General Population (FACT-GP) from item responses.
A data frame with the questionnaire items, appropriately-named.
(optional) The quoted name of a variable in
(optional) Logical, if
(optional) Logical, if
Given a data frame that includes all of the FACT-GP items as variables, appropriately named, this function generates all of the FACT-GP scale scores. It is crucial that the item variables in the supplied data frame are named according to FACT conventions. For example, the first physical well-being item should be named GP1, the second GP2, and so on. Please refer to the materials provided by http://www.facit.org for the particular questionnaire you are using. In particular, refer to the left margin of the official questionnaire (i.e., from facit.org) for the appropriate item variable names.
Most users will want to omit the
arguments or, equivalently, set them both to
FALSE. For more details
on these arguments, see the documentation entry for
Note that the FACT-GP subscale scores are not sums of the item scores. The FACT-GP is meant to be comparable to the FACT-G; however, the FACT-GP has fewer items than the FACT-G due to elimination of the FACT-G items specific to illness or treatment. Therefore, in order to make the FACT-GP scores comparable to those from the FACT-G, they are rescaled to have the same ranges as the corresponding FACT-G scores. See the Brucker et al. (2005) reference for more information.
A data frame with the following scale scores is returned:
PWB - Physical Well-Being subscale
SWB - Social/Family Well-Being subscale
EWB - Emotional Well-Being subscale
FWB - Physical Well-Being subscale
FACT_GP - FACT-GP Total Score (PWB+SWB+EWB+FWB)
If a variable was given to the
id argument, then that variable will
also be in the returned data frame. Additional, relatively unimportant,
variables will be returned if
updateItems = TRUE or
Keep in mind that this function (and R in general) is case-sensitive.
All variables should be in numeric or integer format.
This scoring function expects missing item responses to be coded as NA, 8, or 9, and valid item responses to be coded as 0, 1, 2, 3, or 4. Any other value for any of the items will result in an error message and no scores.
FACT-GP Scoring Guidelines, available at http://www.facit.org
Brucker, P. S., Yost, K., Cashy, J., Webster, K., & Cella, D. (2005). General population and cancer patient norms for the Functional Assessment of Cancer Therapy-General (FACT-G). Evaluation & the Health Professions, 28(2), 192–211.
FACTscorer for more comprehensive information
about using the functions in this package. This function is very similar
scoreFACTG function. See the documentation for
scoreFACTG for more details on the arguments and for
examples. For brevity, examples are omitted below, but can be accessed by
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