added csvstat

pages/common/csvstat.md

@@ -0,0 +1,28 @@
+# csvstat
+
+> Print descriptive statistics for all columns in a CSV file.
+> Included in csvkit.
+
+- Show all stats for all columns:
+
+`csvstat {{data.csv}}`
+
+- Show all stats for columns 2 and 4:
+
+`csvstat -c {{2,4}} {{data.csv}}`
+
+- Show sums for all columns:
+
+`csvstat --sum {{data.csv}}`
+
+- Show averages for all columns:
+
+`csvstat --mean {{data.csv}}`
+
+- Show the max value length for column 3:
+
+`csvstat -c {{1}} --len {{data.csv}}`
+
+- Show the number of unique values in the "name" column:
+
+`csvstat -c {{name}} --unique {{data.csv}}`