Add P-value Significance Symbols

Add p-value significance symbols into a data frame.

add_significance(
  data,
  p.col = NULL,
  output.col = NULL,
  cutpoints = c(0, 1e-04, 0.001, 0.01, 0.05, 1),
  symbols = c("****", "***", "**", "*", "ns")
)

Arguments

data

a data frame containing a p-value column.

p.col

column name containing p-values.

output.col

the output column name to hold the adjusted p-values.

cutpoints

numeric vector used for intervals.

symbols

character vector, one shorter than cutpoints, used as significance symbols.

Value

a data frame

Examples

# Perform pairwise comparisons and adjust p-values
ToothGrowth %>%
 t_test(len ~ dose) %>%
 adjust_pvalue() %>%
 add_significance("p.adj")
#> # A tibble: 3 × 10
#>   .y.   group1 group2    n1    n2 statistic    df        p    p.adj p.adj.signif
#>   <chr> <chr>  <chr>  <int> <int>     <dbl> <dbl>    <dbl>    <dbl> <chr>       
#> 1 len   0.5    1         20    20     -6.48  38.0 1.27e- 7 2.54e- 7 ****        
#> 2 len   0.5    2         20    20    -11.8   36.9 4.4 e-14 1.32e-13 ****        
#> 3 len   1      2         20    20     -4.90  37.1 1.91e- 5 1.91e- 5 ****