because it is being used by another process

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

在回归分析中，如何修改分类变量的参照/参考/ref因子

分类、分箱常用方法

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

环境缺失：Error in library(XXXXX)

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