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Returns a named character vector suitable for vpcPlot's strata argument (length 0 or 1), or NULL when no stratification is warranted. ARM is preferred over SCENARIO when both are multi-valued.
vpcPlot
strata
NULL
ARM
SCENARIO
.auto_strata(x)
a named character vector or NULL
a data frame (typically std_campsis_tbl)
std_campsis_tbl