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--- r:multiple_regression [2021/11/03 23:14] – [Multiple Regression] hkimscil
+++ r:multiple_regression [2023/10/18 23:23] (current) – hkimscil
@@ Line 104: / Line 104: @@
   * unemployment rate (UNEM) = 9%, 12%, 3%
   * spring high school graduating class (HGRAD) = 100000, 98000, 78000
-  * a per capita income (INC) of $30,000, $2800, $36000
+  * a per capita income (INC) of \$30000, \$28000, \$36000
   * 일 때, enrollment는 어떻게 predict할 수 있을까?
@@ Line 218: / Line 218: @@
 see also [[:sequential_regression#eg_3_college_enrollment_in_new_mexico_university|Sequential method]] regression modeling by hand
 see also [[:statistical regression methods]] regression modeling by computing
+<code>
+> fit <- three.predictor.model
+> step <- stepAIC(fit, direction="both")
+Start:  AIC=381.2
+ROLL ~ UNEM + HGRAD + INC
+        Df Sum of Sq      RSS AIC
+<none>               11237313 381
+- UNEM   1   6522098 17759411 392
+- HGRAD  1  12852039 24089352 401
+- INC    1  33568255 44805568 419
+>
+</code>
 ====== Housing ======
 {{housing.txt}}