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--- using_dummy_variables [2026/06/09 23:38] – hkimscil
+++ using_dummy_variables [2026/06/14 23:15] (current) – [Regression with two Catogorical IVs] hkimscil
@@ Line 1137: / Line 1137: @@
 >
 >
+</code>
+{{pasted:20260609-230452.png?600}}
+<code>
 > # 1. 평균을 빼준 값을 새로운 변인으로 저장
 > df$meals_centered <-
@@ Line 1180: / Line 1184: @@
 >
 >
+</code>
+{{pasted:20260609-230505.png?600}}
+<code>
 > # Install the package if you do not have it
 > # install.packages("interactions")
@@ Line 1189: / Line 1197: @@
 >
 >
+</code>
+{{pasted:20260609-230516.png?600}}
+<code>
 > m.ellyr_rnd <- lm(api00~ell+yr_rnd, data=df)
 > summary(m.ellyr_rnd)
@@ Line 1289: / Line 1301: @@
 >
 </code>
+{{pasted:20260609-230601.png?600}}
 </tabbox>
-{{pasted:20260609-230452.png?600}}
-{{pasted:20260609-230505.png?600}}
-{{pasted:20260609-230516.png?600}}
-{{pasted:20260609-230601.png?600}}
 ===== Regression with a categorical and a continuous IV: e.g. 2 =====
@@ Line 1518: / Line 1528: @@
 > nobr.to100 <- coefs[1]+coefs[2]+coefs[4]
 > cat(br.to46, br.to80, br.to100)
-.0131 644.2758 526.33> cat(nobr.to46, nobr.to80, nobr.to100)
+.0131 644.2758 526.33
+> cat(nobr.to46, nobr.to80, nobr.to100)
 .0531 601.3157 483.3699>
 </code>
@@ Line 1624: / Line 1635: @@
 > nobr.to100 <- coefs[1]+coefs[2]+coefs[4]+coefs[6]
 > cat(br.to46, br.to80, br.to100)
-.6855 645.2735 521.4925> cat(nobr.to46, nobr.to80, nobr.to100)
+.6855 645.2735 521.4925
+> cat(nobr.to46, nobr.to80, nobr.to100)
 .4286 593.5333 488
 >
@@ Line 1668: / Line 1680: @@
 이전 식
-y hat = 808.013 + -42.960*(yr_rndno_break) + -163.737(mealcat47-80) + -281.683(mealcat81-100)
+y hat = 808.013 + -42.960 * (nobr) + -163.737 * (to80) + -281.683 * (to100)
 위의 식
-y hat = 809.685 +  -74.257*(yr_rndno_break) +
+y hat = 809.685 +  -74.257*(nobr) +
-                  -164.412*(mealcat47-80) +
+                  -164.412*(to80) +
-                  -288.193*(mealcat81-100) +
+                  -288.193*(to100) +
-.517*(yr_rndno_break:mealcat47-80) +   --> aaaaa case
+.517*(nobr:to80) +   --> aaaaa case
-.764*(yr_rndno_break:mealcat81-100)    --> bbbbb case
+.764*(nobr:to100)    --> bbbbb case
 yr_rnd: