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--- r:chi-square_test [2018/12/03 16:57] – hkimscil
+++ r:chi-square_test [2025/12/02 23:00] (current) – hkimscil
@@ Line 1: / Line 1: @@
-====== chi square test ======
+====== chi square test eg. 1 ======
-<code>
-# read the data
-df <- read.csv("https://goo.gl/j6lRXD")
-# summarize data to table
-table(df$treatment, df$improvement)
-              improved not-improved
-  not-treated       26           29
-  treated           35           15
-</code>
+<tabbed>
+  * :r:chi-square test:code01
+  * *:r:chi-square test:output01
+</tabbed>
-<code># Chi-sq test
+====== chi square test eg. 2 ======
-chi <- chisq.test(df$treatment, df$improvement, correct=FALSE)
+<tabbed>
-chi
+  * :r:chi-square test:code02
-	Pearson's Chi-squared test
+  * *:r:chi-square test:output02
+</tabbed>
-data:  df$treatment and df$improvement
+====== chi square test eg. 3 ======
-X-squared = 5.5569, df = 1, p-value = 0.01841
+<tabbed>
-</code>
+  * :r:chi-square test:code03
+  * *:r:chi-square test:output03
+</tabbed>
+{{tag> statistics r "chi-square test"}}
-<code>> summary(chi)
-          Length Class  Mode
-statistic 1      -none- numeric
-parameter 1      -none- numeric
-p.value   1      -none- numeric
-method    1      -none- character
-data.name 1      -none- character
-observed  4      table  numeric
-expected  4      -none- numeric
-residuals 4      table  numeric
-stdres    4      table  numeric
-> </code>
-<code> round(chi$expected,2)
-             df$improvement
-df$treatment  improved not-improved
-  not-treated    31.95        23.05
-  treated        29.05        20.95
-round(chi$observed,2)
-             df$improvement
-df$treatment  improved not-improved
-  not-treated       26           29
-  treated           35           15
-</code>
-<WRAP box help>
-Do chi-square test as explained in [[:chi-square test]] explanation.
-</WRAP>