R Under development (unstable) (2023-10-04 r85267 ucrt) -- "Unsuffered Consequences"
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> library(matrixTests)
> source("utils/capture.r")
> 
> #--- removing na groups --------------------------------------------------------
> 
> wrn <- '2 columns dropped due to missing group information'
> 
> # 2 NAs
> x <- 1:10
> g <- c(1,1,1,1,NA,NA,2,2,2,2)
> res <- capture(row_oneway_welch(x, g))
> stopifnot(all.equal(res$warning, wrn))
> stopifnot(all.equal(res$value$obs.tot, 8))
> stopifnot(all.equal(res$value$obs.groups, 2))
> 
> 
> #--- groups with one observations ----------------------------------------------
> 
> # TODO: In order to be consistent with tests that remove empty groups either:
> #       1) Only show this warning in cases where group with 1 observation is removed.
> #       2) Make other tests show similar warnings where empty groups are removed.
> wrn <- 'row_oneway_welch: 1 of the rows had groups with less than 2 observations: those groups were removed.\nFirst occurrence at row 1'
> 
> # 3 groups with one having only one observation
> x <- 1:5
> g <- c("a","a","b","b","c")
> res <- capture(row_oneway_welch(x, g))
> stopifnot(all.equal(res$warning, wrn))
> stopifnot(all.equal(res$value$obs.tot, 4))
> stopifnot(all.equal(res$value$obs.groups, 2))
> 
> # 3 groups with 1 having one observation due to NA values
> x <- c(1:4, NA, 1)
> g <- c("a","a","b","b","c","c")
> res <- capture(row_oneway_welch(x, g))
> stopifnot(all.equal(res$warning, wrn))
> stopifnot(all.equal(res$value$obs.tot, 4))
> stopifnot(all.equal(res$value$obs.groups, 2))
> 
> 
> #--- less than 2 groups --------------------------------------------------------
> 
> wrn <- 'row_oneway_welch: 1 of the rows had less than 2 groups with enough observations.\nFirst occurrence at row 1'
> nacolumns <- c("df.between", "df.within", "statistic", "pvalue")
> 
> # all values in one group
> x <- 1:10
> g <- rep("a", 10)
> res <- capture(row_oneway_welch(x, g))
> stopifnot(all.equal(res$warning, wrn))
> stopifnot(all(is.na(res$value[,nacolumns])))
> stopifnot(all.equal(res$value$obs.tot, 10))
> stopifnot(all.equal(res$value$obs.groups, 1))
> 
> # many groups but all have one observation
> x <- 1:10
> g <- letters[1:10]
> res <- capture(row_oneway_welch(x, g))
> stopifnot(all.equal(res$warning, wrn))
> stopifnot(all(is.na(res$value[,nacolumns])))
> stopifnot(all.equal(res$value$obs.tot, 0))
> stopifnot(all.equal(res$value$obs.groups, 0))
> 
> # two groups but one has only a single observation and is removed
> x <- 1:4
> g <- c("a","a","a","b")
> res <- capture(row_oneway_welch(x, g))
> stopifnot(all.equal(res$warning, wrn))
> stopifnot(all(is.na(res$value[,nacolumns])))
> stopifnot(all.equal(res$value$obs.tot, 3))
> stopifnot(all.equal(res$value$obs.groups, 1))
> 
> # two groups but one has only NAs
> x <- c(1:3, NA, NA, NA)
> g <- rep(c("a","b"), each=3)
> res <- capture(row_oneway_welch(x, g))
> stopifnot(all.equal(res$warning, wrn))
> stopifnot(all(is.na(res$value[,nacolumns])))
> stopifnot(all.equal(res$value$obs.tot, 3))
> stopifnot(all.equal(res$value$obs.groups, 1))
> 
> 
> #--- all groups have zero variance ---------------------------------------------
> 
> wrn <- 'row_oneway_welch: 1 of the rows had zero variance in all of the groups.\nFirst occurrence at row 1'
> nacolumns <- c("df.between", "df.within", "statistic", "pvalue")
> 
> # two groups - all values are constant
> x <- c(1,1,1,1)
> g <- c("a","a","b","b")
> res <- capture(row_oneway_welch(x, g))
> stopifnot(all.equal(res$warning, wrn))
> stopifnot(all(is.na(res$value[,nacolumns])))
> stopifnot(all.equal(res$value$obs.tot, 4))
> stopifnot(all.equal(res$value$obs.groups, 2))
> 
> # two groups - constant values within each group
> x <- c(3,3,0,0)
> g <- c("a","a","b","b")
> res <- capture(row_oneway_welch(x, g))
> stopifnot(all.equal(res$warning, wrn))
> stopifnot(all(is.na(res$value[,nacolumns])))
> stopifnot(all.equal(res$value$obs.tot, 4))
> stopifnot(all.equal(res$value$obs.groups, 2))
> 
> # two groups - constant values plus NA within each group
> x <- c(3,3,NA,0,0,NA)
> g <- c("a","a","a","b","b","b")
> res <- capture(row_oneway_welch(x, g))
> stopifnot(all.equal(res$warning, wrn))
> stopifnot(all(is.na(res$value[,nacolumns])))
> stopifnot(all.equal(res$value$obs.tot, 4))
> stopifnot(all.equal(res$value$obs.groups, 2))
> 
> 
> #--- one of the groups has zero variance ---------------------------------------
> 
> wrn <- 'row_oneway_welch: 1 of the rows had groups with zero variance: result might be unreliable.\nFirst occurrence at row 1'
> 
> # two groups - one with constant values
> x <- c(1,2,1,1)
> g <- c("a","a","b","b")
> res <- capture(row_oneway_welch(x, g))
> stopifnot(all.equal(res$warning, wrn))
> stopifnot(all.equal(res$value$statistic, Inf))
> 
> # three groups - constant values within two of them
> x <- c(1,2,3,3,5,5)
> g <- c("a","a","b","b","c","c")
> res <- capture(row_oneway_welch(x, g))
> stopifnot(all.equal(res$warning, wrn))
> stopifnot(all.equal(res$value$statistic, Inf))
> 
> 
> proc.time()
   user  system elapsed 
   0.14    0.06    0.20