fix DIC definition

Author: abmantz

Day5/model_selection/modelevaluation.ipynb

@@ -561,7 +561,7 @@
     "    av_of_D = np.mean(-2.0*st.norm.logpdf(y))\n",
     "    D_of_av = -2.0*st.norm.logpdf( np.mean(y) )\n",
     "    pD = av_of_D - D_of_av\n",
-    "    DIC = av_of_D + 2*pD\n",
+    "    DIC = D_of_av + 2*pD\n",
     "    return av_of_D, D_of_av, pD, DIC\n",
     "\n",
     "print(DIC_thingy(-1.0, 1.0))\n",