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fix unpaired sleep data conf interval example #121

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fix unpaired sleep data conf interval example #121

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fd04acf
fix unpaired sleep data conf interval example
scottwalters Dec 27, 2015
52cefce
typo; data frome -> data frame
scottwalters Jan 2, 2016
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2 changes: 1 addition & 1 deletion 06_StatisticalInference/08_tCIs/index.Rmd
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Expand Up @@ -178,7 +178,7 @@ sp <- sqrt((7 * 15.34^2 + 20 * 18.23^2) / (8 + 21 - 2))
## Mistakenly treating the sleep data as grouped
```{r}
n1 <- length(g1); n2 <- length(g2)
sp <- sqrt( ((n1 - 1) * sd(x1)^2 + (n2-1) * sd(x2)^2) / (n1 + n2-2))
sp <- sqrt( ((n1 - 1) * sd(g1)^2 + (n2-1) * sd(g2)^2) / (n1 + n2-2))
md <- mean(g2) - mean(g1)
semd <- sp * sqrt(1 / n1 + 1/n2)
rbind(
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2 changes: 1 addition & 1 deletion 06_StatisticalInference/13_Resampling/index.Rmd
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Expand Up @@ -173,7 +173,7 @@ g
## Permutation tests
- Consider the null hypothesis that the distribution of the observations from each group is the same
- Then, the group labels are irrelevant
- Consider a data frome with count and spray
- Consider a data frame with count and spray
- Permute the spray (group) labels
- Recalculate the statistic
- Mean difference in counts
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