Affix conventions for grouping a SAS candidate pool into concepts

Defaults for concept_of, concept_map and friends, describing the naming conventions a legacy vars.sas uses: ln_ (log), in_ (inverse), in2 (inverse squared) and a trailing 2 (squared).

POOL_PLAIN_SUFFIX is the suffix untransformed measurements carry (crcl_pr, bun_pr, hct_pr). POOL_MIN_STEM guards the prefix rule: two characters would match half a pool by accident.

These are defaults, not constants – pass your study's own conventions through the affixes, plain_suffix and min_stem arguments where they differ, rather than editing a copy of this package.

Usage

POOL_AFFIXES

POOL_PLAIN_SUFFIX

POOL_MIN_STEM

Format

Character vectors, and an integer for POOL_MIN_STEM.

Examples

POOL_AFFIXES
#> [1] "^ln_" "^in2" "^in_" "2$"  
pool <- c("age", "age2", "crcl_pr", "ln_crcl_pr")
concept_map(pool)
#>     variable concept representative
#> 1        age     age           TRUE
#> 2       age2     age          FALSE
#> 3    crcl_pr crcl_pr           TRUE
#> 4 ln_crcl_pr crcl_pr          FALSE
# A study whose trailing 2 does not mean "squared" drops that affix.
concept_map(pool, affixes = setdiff(POOL_AFFIXES, "2$"))
#>     variable concept representative
#> 1        age     age           TRUE
#> 2       age2    age2           TRUE
#> 3    crcl_pr crcl_pr           TRUE
#> 4 ln_crcl_pr crcl_pr          FALSE