[英]R: incorporating fisher.test into Hmisc's summaryM leads to error
catTestfisher <-
function (tab)
{
st <- if (!is.matrix(tab) || nrow(tab) < 2 | ncol(tab) <
2)
list(p.value = NA, statistic = NA, parameter = NA)
else {
rowcounts <- tab %*% rep(1, ncol(tab))
tab <- tab[rowcounts > 0, ]
if (!is.matrix(tab))
list(p.value = NA, statistic = NA, parameter = NA)
else fisher.test(tab)
}
list(P = st$p.value, stat = "", df = "",
testname = "Fisher's Exact", statname = "", latexstat = "", namefun = "",
plotmathstat = "")
}
I wanted to use library(Hmisc)
's summaryM
function but with Fisher's exact test, so I wrote a catTestfisher
function and set catTest = catTestfisher
in my own summaryM2
function, which is exactly the same as summaryM
, except for catTest = catTestfisher
我想使用
library(Hmisc)
的summaryM
函数,但要使用Fisher的精确测试,所以我编写了catTestfisher
函数,并在自己的summaryM2
函数中设置catTest = catTestfisher
,该函数与summaryM
,除了catTest = catTestfisher
summaryM2 <-
function (formula, groups = NULL, data = NULL, subset, na.action = na.retain,
overall = FALSE, continuous = 10, na.include = FALSE, quant = c(0.025,
0.05, 0.125, 0.25, 0.375, 0.5, 0.625, 0.75, 0.875, 0.95,
0.975), nmin = 100, test = FALSE, conTest = conTestkw,
catTest = catTestfisher, ordTest = ordTestpo)
{
marg <- length(data) && ".marginal." %in% names(data)
if (marg)
formula <- update(formula, . ~ . + .marginal.)
formula <- Formula(formula)
Y <- if (!missing(subset) && length(subset))
model.frame(formula, data = data, subset = subset, na.action = na.action)
else model.frame(formula, data = data, na.action = na.action)
X <- model.part(formula, data = Y, rhs = 1)
Y <- model.part(formula, data = Y, lhs = 1)
getlab <- function(x, default) {
lab <- attr(x, "label")
if (!length(lab) || lab == "")
default
else lab
}
if (marg) {
xm <- X$.marginal.
X$.marginal. <- NULL
}
else xm <- rep("", nrow(X))
if (length(X)) {
xname <- names(X)
if (length(xname) == 1 && !length(groups))
groups <- xname
if (!length(groups) && length(xname) > 1) {
warnings("Must specify groups when > 1 right hand side variable is present.\ngroups taken as first right hand variable.")
groups <- xname[1]
}
svar <- if (length(xname) == 1)
factor(rep(".ALL.", nrow(X)))
else do.call("interaction", list(X[setdiff(xname, groups)],
sep = " "))
group <- X[[groups]]
glabel <- getlab(group, groups)
}
else {
svar <- factor(rep(".ALL.", nrow(Y)))
group <- rep("", nrow(Y))
groups <- group.freq <- NULL
glabel <- ""
}
quants <- unique(c(quant, 0.025, 0.05, 0.125, 0.25, 0.375,
0.5, 0.625, 0.75, 0.875, 0.95, 0.975))
nv <- ncol(Y)
nameY <- names(Y)
R <- list()
for (strat in levels(svar)) {
instrat <- svar == strat
n <- integer(nv)
type <- n
comp <- dat <- vector("list", nv)
names(comp) <- names(dat) <- nameY
labels <- Units <- vector("character", nv)
if (test) {
testresults <- vector("list", nv)
names(testresults) <- names(comp)
}
gr <- group[instrat]
xms <- xm[instrat]
if (all(xms != ""))
xms <- rep("", length(xms))
group.freq <- table(gr)
group.freq <- group.freq[group.freq > 0]
if (overall)
group.freq <- c(group.freq, Combined = sum(group.freq))
for (i in 1:nv) {
w <- Y[instrat, i]
if (length(attr(w, "label")))
labels[i] <- attr(w, "label")
if (length(attr(w, "units")))
Units[i] <- attr(w, "units")
if (!inherits(w, "mChoice")) {
if (!is.factor(w) && !is.logical(w) && length(unique(w[!is.na(w)])) <
continuous)
w <- as.factor(w)
s <- !is.na(w)
if (na.include && !all(s) && length(levels(w))) {
w <- na.include(w)
levels(w)[is.na(levels(w))] <- "NA"
s <- rep(TRUE, length(s))
}
n[i] <- sum(s & xms == "")
w <- w[s]
g <- gr[s, drop = TRUE]
if (is.factor(w) || is.logical(w)) {
tab <- table(w, g)
if (test) {
if (is.ordered(w))
testresults[[i]] <- ordTest(g, w)
else testresults[[i]] <- catTest(tab)
}
if (nrow(tab) == 1) {
b <- casefold(dimnames(tab)[[1]], upper = TRUE)
pres <- c("1", "Y", "YES", "PRESENT")
abse <- c("0", "N", "NO", "ABSENT")
jj <- match(b, pres, nomatch = 0)
if (jj > 0)
bc <- abse[jj]
else {
jj <- match(b, abse, nomatch = 0)
if (jj > 0)
bc <- pres[jj]
}
if (jj) {
tab <- rbind(tab, rep(0, ncol(tab)))
dimnames(tab)[[1]][2] <- bc
}
}
if (overall)
tab <- cbind(tab, Combined = apply(tab, 1,
sum))
comp[[i]] <- tab
type[i] <- 1
}
else {
sfn <- function(x, quant) {
o <- options(digits = 10)
on.exit(options(o))
c(quantile(x, quant), Mean = mean(x), SD = sqrt(var(x)),
N = sum(!is.na(x)))
}
qu <- tapply(w, g, sfn, simplify = TRUE, quants)
if (test)
testresults[[i]] <- conTest(g, w)
if (overall)
qu$Combined <- sfn(w, quants)
comp[[i]] <- matrix(unlist(qu), ncol = length(quants) +
3, byrow = TRUE, dimnames = list(names(qu),
c(format(quants), "Mean", "SD", "N")))
if (any(group.freq <= nmin))
dat[[i]] <- lapply(split(w, g), nmin = nmin,
function(x, nmin) if (length(x) <= nmin)
x
else NULL)
type[i] <- 2
}
}
else {
w <- as.numeric(w) == 1
n[i] <- sum(!is.na(apply(w, 1, sum)) & xms ==
"")
g <- as.factor(gr)
ncat <- ncol(w)
tab <- matrix(NA, nrow = ncat, ncol = length(levels(g)),
dimnames = list(dimnames(w)[[2]], levels(g)))
if (test) {
pval <- numeric(ncat)
names(pval) <- dimnames(w)[[2]]
d.f. <- stat <- pval
}
for (j in 1:ncat) {
tab[j, ] <- tapply(w[, j], g, sum, simplify = TRUE,
na.rm = TRUE)
if (test) {
tabj <- rbind(table(g) - tab[j, ], tab[j,
])
st <- catTest(tabj)
pval[j] <- st$P
stat[j] <- st$stat
d.f.[j] <- st$df
}
}
if (test)
testresults[[i]] <- list(P = pval, stat = stat,
df = d.f., testname = st$testname, statname = st$statname,
latexstat = st$latexstat, plotmathstat = st$plotmathstat)
if (overall)
tab <- cbind(tab, Combined = apply(tab, 1,
sum))
comp[[i]] <- tab
type[i] <- 3
}
}
labels <- ifelse(nchar(labels), labels, names(comp))
R[[strat]] <- list(stats = comp, type = type, group.freq = group.freq,
labels = labels, units = Units, quant = quant, data = dat,
N = sum(!is.na(gr) & xms == ""), n = n, testresults = if (test) testresults)
}
structure(list(results = R, group.name = groups, group.label = glabel,
call = call, formula = formula), class = "summaryM")
}
After trying to test it on the following data, I get a warning and an error: 在尝试对以下数据进行测试后,我得到一个警告和一个错误:
library(Hmisc)
set.seed(173)
sex <- factor(sample(c("m","f"), 500, rep=TRUE))
treatment <- factor(sample(c("Drug","Placebo"), 500, rep=TRUE))
> summaryM2(sex ~ treatment, test=TRUE, overall = TRUE)
Error in round(teststat, 2) :
non-numeric argument to mathematical function
I tried stepping through the summaryM2
function line by line, but could not figure out what's causing the problem. 我尝试
summaryM2
逐步执行summaryM2
函数,但无法找出导致问题的原因。
In your catTestfisher
function, the output variables stat
(test statistic) and df
(degrees of freedom) should be numeric variables not empty strings. 在
catTestfisher
函数中,输出变量stat
(测试统计量)和df
(自由度)应为数字变量,而不是空字符串。 In the programming stat
is coverted to teststat
for rounding before being outputted (hence the error message for round("", 2)
is non-numeric argument to mathematical function
). 在编程
stat
在输出之前会被teststat
到teststat
进行舍入(因此round("", 2)
的错误消息是non-numeric argument to mathematical function
)。 See lines 1718 to 1721 in the summary.formula
code ) . 请参阅
summary.formula
代码中的第1718至1721行)。
You can set df = NULL
but a value is required for stat
(not NA
or NULL
) otherwise no output is returned. 您可以设置
df = NULL
但是stat
需要一个值(不是NA
或NULL
),否则不返回任何输出。 You can get around the problem by setting stat = 0
(or any other number), and then only displaying the p value using prtest = "P"
. 您可以通过设置
stat = 0
(或任何其他数字)来解决该问题,然后仅使用prtest = "P"
显示p值。
catTestfisher2 <- function (tab)
{
st <- fisher.test(tab)
list(P = st$p.value, stat = 0, df = NULL,
testname = st$method, statname = "", latexstat = "", namefun = "",
plotmathstat = "")
}
output <- summaryM(sex ~ treatment, test=TRUE, overall = TRUE, catTest = catTestfisher2)
print(output, prtest = "P")
Descriptive Statistics (N=500)
+-------+-----------+-----------+-----------+-------+
| |Drug |Placebo |Combined |P-value|
| |(N=257) |(N=243) |(N=500) | |
+-------+-----------+-----------+-----------+-------+
|sex : m|0.52 (133)|0.52 (126)|0.52 (259)| 1 |
+-------+-----------+-----------+-----------+-------+
Note there is no need to define your own summaryM2 function. 注意,不需要定义自己的summaryM2函数。 Just use
catTest =
to pass in your function. 只需使用
catTest =
即可传入您的函数。
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