Commit 5625c301 authored by Holger Brandl's avatar Holger Brandl

updated docs

parent b70ba816
# rnblight
Update markdown result chunks in markdown documents
```bash
cd /Users/brandl/Dropbox/projects/datautils/R/rnblight
#cp /Users/brandl/Dropbox/documents/datascience/chi2.md rerender/
#cp -r /Users/brandl/Dropbox/documents/datascience/.chi2_images rerender/
#
#git init
#git add chi2.md
#git commit -m "initial commit"
mdInput=chi2.md
mdBase=$(basename $mdInput .md)
mv $mdInput ${mdBase}.Rmd
Rscript - <<EOF
knitr::knit('${mdBase}.Rmd', '${mdBase}.md')
EOF
idea .
```
\ No newline at end of file
Frequency tests
================
* Example: Prop of dieting woman higher than for men?
![](.example_images/fisher_example.png)
```
?fisher.test
```
Proportion Tests
================
```{r}
prop.test(x=333, n=1022, conf.level=0.98)
prop.test(x=333, n=1022)
```
From
http://stats.stackexchange.com/questions/60073/confidence-interval-for-difference-between-proportions
The sample size is 34, of which 19 are females and 15 are males. Therefore, the difference in proportions is 0.1176471.
```{r}
19/34 - 15/34
prop.test(x=c(19,15), n=c(34,34), correct=FALSE)
## also works for single proportion
#prop.test(x=c(19), n=c(34), correct=FALSE)
#prop.test(x=c(19,15,20), n=c(34,34,34), correct=FALSE)
```
Also see <http://stat.ethz.ch/R-manual/R-devel/library/stats/html/prop.test.html>
Nice math introhttps://onlinecourses.science.psu.edu/statprogram/node/164 with t-statistc
Confidence around proportions
-----------------------------
Formula:
> If the samples size n and population proportion p satisfy the condition that np ≥ 5 and n(1 − p) ≥ 5, than the end points of the interval estimate at (1 − α) confidence level is defined in terms of the sample proportion as follows.
![](.example_images/prop_ci.png)
CI math is detailed out under http://www.statisticslectures.com/topics/ciproportions/
```{r}
prop.test(x=333, n=1022, conf.level=0.98)
plot(1:10)
plot(1:10)
prop.test(x=333, n=1022)
plot(1:10)
```
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment