I want to write a switch statement in r with three conditions but can't seem to get it to work. What am I doing wrong?

```r
# assigning some values
test.type <- "p"
var.equal<- TRUE
  paired <- FALSE

# preparing text for which p-value adjustment method was used
test.description <- switch(
    EXPR = test.type & var.equal & paired,
    "p" & TRUE & TRUE = "Student's t-test",
    "p" & FALSE & TRUE = "Student's t-test",
    "p" & TRUE & FALSE = "Student's t-test",
    "p" & FALSE & FALSE = "Games-Howell test",
    "np" & TRUE & TRUE = "Durbin-Conover test"
  )
#> Error: <text>:10:23: unexpected '='
#> 9:     EXPR = test.type & var.equal & paired,
#> 10:     "p" & TRUE & TRUE =
#>                           ^

```

Created on 2018-11-08 by the [reprex package](https://reprex.tidyverse.org) (v0.2.1)

A simpler version of this statement with just one condition *does* work-

```r
# simpler switch
(test.description <- switch(
  EXPR = test.type,
  "p"  = "Student's t-test",
  "np" = "Durbin-Conover test"
))
#> [1] "Student's t-test"

```

Created on 2018-11-08 by the [reprex package](https://reprex.tidyverse.org) (v0.2.1)