diff --git a/Assignment 9.R b/Assignment 9.R
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+#Exercise 9
+  
+#Set working directory, create vector for coefficient of variation
+setwd(dir)
+files<-list.files(dir)
+CoefVar<-function(dir, col, nrow=50){
+CoefVarVector<-numeric(0)
+  
+#Loop files in directory to determine coefficient of variation
+for (i in files){
+  i<-read.csv(i, sep=",", header=TRUE, stringsAsFactors=FALSE, fill=TRUE)
+  if(ncol(i)<col){
+    print("ERROR invalid column number")
+  }else{
+    if(nrow(i)<50){
+      Q<-print("ERROR invalid number of observations. Input O to override or any other key to stop: ")
+      if(Q=="O"){
+        standdev=sd(i[,col])
+        mean=mean(i[,col])
+        CoefVar=standdev/mean
+        CoefVarVector=c(CoefVarVector, CoefVar)
+      }else{
+        print("CYA!")
+      }
+    }else{
+      standdev=sd(i[,col])
+      mean=mean(i[,col])
+      CoefVar=standdev/mean
+      CoefVarVector=c(CoefVarVector, CoefVar)
+    }
+  }
+}
+return(CoefVarVector)
+}
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