diff -r b1a51285de7e -r 7f3f01dfe738 testing/drumb_test3.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing/drumb_test3.scala	Wed Nov 08 13:57:13 2017 +0000
@@ -0,0 +1,36 @@
+//println("starting test now")
+
+/*
+import scala.concurrent._
+import scala.concurrent.duration._
+import ExecutionContext.Implicits.global
+import scala.language.postfixOps 
+
+val test_data = List(List(Some(71.539941), None), List(Some(76.974614), None), 
+                     List(Some(65.226685), Some(6.35)), List(Some(78.354649), Some(12.241)), 
+                     List(Some(85.517645), Some(38.188)))
+
+val test_deltas = List(List(Some(0.07596697626574789), None), 
+                       List(Some(-0.152620823795232), None), 
+                       List(Some(0.20126676681483952), Some(0.9277165354330709)), 
+                       List(Some(0.09141762603007778), Some(2.119679764725104)))
+
+lazy val f = Future {
+  assert((yearly_yield(test_deltas, 100, 0) - 107).abs <= 2)
+  assert((yearly_yield(test_deltas, 100, 1) - 85).abs <= 2)
+  assert((yearly_yield(test_deltas, 100, 2) - 156).abs <= 2)
+  assert((yearly_yield(test_deltas, 100, 3) - 210).abs <= 2)
+  assert((investment(List("IBM", "BIDU"), 2004 to 2008, 100) - 298).abs <= 10)
+}
+
+
+Await.result(f, 180 second)
+
+*/
+
+val urban_prices = List(List(Some(311.349976), Some(27.505054)), 
+			List(Some(300.222351), Some(42.357094)), 
+			List(Some(330.555054), Some(52.852215)))
+
+
+assert(CW6c.yearly_yield(CW6c.get_deltas(urban_prices), 100, 0) == 125)