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--- pe:r-lang [2019/04/19 11:17]
218.186.146.102
+++ pe:r-lang [2020/03/24 02:34] (current)
@@ Line 23: / Line 23: @@
 {{:pe:vsl_success.png?200|}}
 Histogram to check shape of distribution --> looks skewed to the right
+<code rsplus>
   > shapiro.test(vsltime$time)
@@ Line 31: / Line 33: @@
   data:  vsltime$time
   W = 0.91157, p-value = 1.388e-14
+</code>
 Shapiro-Wilk test for normality --> not normal distribution
+<code rsplus>
   > hist(vsl$success)
+</code>
 {{:pe:vsl_success.png?200|}}
+<code rsplus>
   > shapiro.test(vsl$success)
         Shapiro-Wilk normality test
   data:  vsl$success
   W = 0.9117, p-value = 0.0002277
+</code>
 Some other analyses:
+<code rsplus>
   > plot(vsl$exp,vsl$rate,main="Anastomosis success rate vs experience (in years)")
   > plot(vsl$exp,vsl$totnum)
   > plot(vsl$exp,((vsl$totnum/8)+(vsl$rate))/2)
+</code>
 {{:pe:successrate_number_vs_exp.png?400|}}
-Suggests that the first few years of experience does not seem to make a difference to performance, but many years of experience does (? self-selection or already some training).
+Suggests that the first few years of experience does not seem to make a difference to performance, but many years of experience does (? self-selection or already some training). //Some form of correlation analysis might be helpful here.//
+===Spread===
+<code rsplus>
   > stem(((vsl$totnum/8)+(vsl$rate))/2)
@@ Line 76: / Line 86: @@
 | 0000003333366666888
 | 0000000000000000000000
+</code>
+See also [[r:20190423|Combined 13-14]]
-Sources:
+====Sources====
   * http://www.sthda.com/english/wiki/normality-test-in-r
   * https://www.rdocumentation.org/packages/graphics/versions/3.5.3/topics/hist

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