描述在 R 中不起作用的函数

Question

我正在尝试使用 psych 包中的 describe 函数。但是，我收到以下错误：

描述中的错误（ToothGrowth）： description 必须是长度至少为 1 的字符串

我确保重新安装包，加载它，并从数据集库附加一个示例 data(ToothGrowth)，但仍然收到此错误。

R version 3.1.2 (2014-10-31) 
Platform: x86_64-w64-mingw32/x64 (64-bit) 

locale: 
[1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United States.1252 
[3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C 
[5] LC_TIME=English_United States.1252 

attached base packages: 
[1] tools tcltk stats4 splines parallel grid compiler 
[8] stats graphics grDevices utils datasets methods base 

Answer 1

问题是testthat::describe 覆盖psych::describe：

library(psych)
data(ToothGrowth)
describe(ToothGrowth)
# Warning in FUN(newX[, i], ...) :
#   no non-missing arguments to min; returning Inf
# Warning in FUN(newX[, i], ...) :
#   no non-missing arguments to max; returning -Inf
#       vars  n  mean   sd median trimmed  mad min  max range  skew kurtosis   se
# len      1 60 18.81 7.65  19.25   18.95 9.04 4.2 33.9  29.7 -0.14    -1.04 0.99
# supp*    2 60   NaN   NA     NA     NaN   NA Inf -Inf  -Inf    NA       NA   NA
# dose     3 60  1.17 0.63   1.00    1.15 0.74 0.5  2.0   1.5  0.37    -1.55 0.08

library(testthat)
# Attaching package: ‘testthat’

# The following object is masked from ‘package:psych’:

#     describe    <-- overrides describe function of psych package

# The following object is masked from ‘package:sos’:

#     matches

describe(ToothGrowth)
# Error in describe(ToothGrowth) : 
#   description must be a string of at least length 1

一种解决方案是在psych 之前加载testthat。另一个就是说使用哪个describe函数：

psych::describe(ToothGrowth)