限制性立方样条：Error in quantile.default(WD[, var predictl, plotRcs::knot(num point pred)).(unordered)factors are not allowed

Error in if (series_types_datafarme$type[series_types_datafarme$var == : argument is of length zero

分类、分箱常用方法

Error in readRDS(model URl port) : ‘file’◆◆◆◆◆◆◆

导入数据：’utf-8′ codec can’t decode byte 0xa1 in position 10971: invalid start byte

在回归分析中，如何修改分类变量的参照/参考/ref因子

环境缺失：Error in library(XXXXX)