diff --git a/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java b/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
index 53ccd58..8484eaa 100644
--- a/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
+++ b/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
@@ -231,9 +231,22 @@ public class Spreadsheet {
 	 * @return The standard deviation calculated.
 	 */
 	private long stabw(String startCellName, String endCellName) {
+		long mean = mit(startCellName, endCellName);
+		long counter = counterOfCellsWithValue(startCellName, endCellName);
+		long result = 0;
 
+		for(char col = startCellName.charAt(0); col <= endCellName.charAt(0); col++) {
 
-		return 0;
+			for (int row = Integer.parseInt(startCellName.substring(1)); row <= Integer.parseInt(endCellName.substring(1)); row++) {
+
+				String value = get((row - 1), (col - 'A'));
+
+				if(!value.isEmpty()){
+					result += (long) Math.pow(Long.parseLong(value) - mean, 2);
+				}
+			}
+		}
+		return (long) Math.sqrt(result / counter);
 	}
 
 	/**