我正在尝试重现一个补充示例 2 Continuous response: a dose-response curve from the drc package。
尝试运行时
coeftest(ryegrass.LL.4, vcov = sandwich)
,出现以下错误:
Error in UseMethod("estfun") : no applicable method for 'estfun' applied to an object of class "drc".
我试图用谷歌搜索错误但没有成功并使用vcov.
代替vcov
(因为 vcov. 在 R 中自动建议,但文章使用 vcov)但仍然得到相同的错误。
任何想法如何解决这个问题?
会话信息:
R version 4.0.3 (2020-10-10)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19041)
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] lmtest_0.9-38 zoo_1.8-8 sandwich_3.0-0 drc_3.0-1 MASS_7.3-53
loaded via a namespace (and not attached):
[1] zip_2.1.1 Rcpp_1.0.5 pillar_1.4.7 compiler_4.0.3 cellranger_1.1.0
[6] forcats_0.5.0 tools_4.0.3 lifecycle_0.2.0 tibble_3.0.4 lattice_0.20-41
[11] pkgconfig_2.0.3 rlang_0.4.8 Matrix_1.2-18 openxlsx_4.2.3 rstudioapi_0.13
[16] curl_4.3 mvtnorm_1.1-1 haven_2.3.1 xfun_0.18 rio_0.5.16
[21] vctrs_0.3.5 gtools_3.8.2 hms_0.5.3 grid_4.0.3 data.table_1.13.4
[26] R6_2.5.0 plotrix_3.7-8 survival_3.2-7 readxl_1.3.1 foreign_0.8-80
[31] multcomp_1.4-15 TH.data_1.0-10 carData_3.0-4 car_3.0-10 magrittr_1.5
[36] scales_1.1.1 codetools_0.2-16 splines_4.0.3 ellipsis_0.3.1 abind_1.4-5
[41] colorspace_2.0-0 tinytex_0.26 stringi_1.5.3 munsell_0.5.0 crayon_1.3.4