R语言脉冲响应分析

1. da_sf<-data_sec[,c(6,8)]
   
2. head(da_sf)
   
3. names(da_sf)
   
4. var.2c.alt <- VAR(da_sf, p = 2, type = "const")
   
5. var.2c.alt
   
6. irf.rw.eU <- irf(var.2c.alt, impulse = "rw", response = "dSF", boot = TRUE)

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如上所示，先做VAR模型，其中有两个变量“VOL”、“dSF”，然后运行最后一行，总是出现错误，并提示：

图片上传失败，错误提示如下：
Error in irf.varest(var.2c.alt, impulse = "rw", response = "dSF", boot = TRUE) :
  
Please provide variables names in impulse
that are in the set of endogenous variables.

我觉得是response的参数设置错误