Generates all of the scores of the Functional Assessment of Cancer Therapy - Melanoma (FACT-M, v4) from item responses.
A data frame with the questionnaire items, appropriately-named.
(optional) The quoted name of a variable in
(optional) Logical, if omitted or set to
(optional) Logical, if
(optional) Logical, if
Given a data frame that includes all of the FACT-M (Version 4) items as variables, appropriately named, this function generates all of the FACT-M 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.
This questionnaire consists of two components: (1) FACT-G items and (2)
"Additional Concerns" items. The FACT-G items (G for General) measure
general aspects of QoL common to all cancer patients. The "Additional
Concerns" items measure issues relevant for a specific cancer type,
treatment, or symptom. These two questionnaire components are typically
administered together. In some studies, however, ONLY the "Additional
Concerns" items are administered. The
AConly argument is provided to
accommodate such cases, and should be set to
AConly = TRUE if ONLY the
"Additional Concerns" items were administered.
For more details on the
arguments, see the documentation entry for
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
FACTG - FACT-G Total Score (PWB+SWB+EWB+FWB)
MS - Melanoma subscale
MSS - Melanoma Surgery subscale
FACT_M_TOTAL - FACT-M Total Score (PWB+SWB+EWB+FWB+MS)
FACT_M_TOI - FACT-M Trial Outcome Index (PWB+FWB+MS)
AConly = TRUE, the only scale scores returned are MS and
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-M Scoring Guidelines, available at http://www.facit.org
Cormier, J., Davidson, L., Xing, Y., Webster, K., & Cella, D. (2005). Measuring quality of life in patients with melanoma: Development of the FACT-Melanoma Subscale. The Journal of Supportive Oncology, 3(5), 139-145.
This function is very similar to the
function. To see examples of function usage, please see the documentation
scoreFACT_B. For additional details on the function
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## Not run: ## To see examples using this function, run: example(scoreFACT_M) ## Also see the examples for the very similar scoreFACT_B function ## End(Not run)
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