From 5227328489b931ae9c772bfc646b9b4c00c55355 Mon Sep 17 00:00:00 2001
From: caes <xaw5719@wmich.edu>
Date: Mon, 23 Jan 2017 05:18:56 -0500
Subject: [PATCH] added notes

---
 hw1/notes | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 hw1/notes

diff --git a/hw1/notes b/hw1/notes
new file mode 100644
index 0000000..9d66942
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+1. (a) 
+
+To test the quality of a regression fit use mean squared error.
+
+       1   ₙ
+MSE = ───  ∑ (yᵢ - f̂(xᵢ))² 
+       n   ⁱ⁼¹
+
+
+
+Ave(y₀ - f(x₀))²
+
+
+To test the quality of a model in the classification settings, use the error rate:
+
+         1   ₙ
+    E = ─── ∑ I(yᵢ ≠ ŷᵢ)
+         n   ⁱ⁼¹