使用 drc 包绘制剂量反应曲线时出错

问题描述

我正在尝试拟合四参数逻辑模型以使用 drc 包绘制剂量反应曲线。代码如下所示。尝试拟合如下模型时出现错误，请指导我解决问题，谢谢！

优化错误(startVec,opfct,hessian = TRUE,method = optMethod,control = list(maxit = maxIt,: 由 optim 提供的非有限值 drmOpt(opfct,opfct1,startVecSc,optMethod,constrained,warnVal,中的错误： 收敛失败

# growth inhibition = gi,concentration = conc
gi <- c("0","5.24","24.2","37.2","71.9","80","100","0","15.1","42.8","61.8","73.5","97.3","100")
conc <- c("0","167","278.89","465.74","777.79","1298.91","2169.19","2169.19" )
df <- data.frame(conc,gi)
print(df)
library("MASS")
library("stats")
library("drc")
# Fit a log-logistic model (LL.4) with lower and upper asymptotic limits fixed at respectively 0 and 100
x <- drm(gi ~ conc,data = df,fct = LL.4(fixed = c(NA,100,NA)))```

解决方法

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