Timeline for Neyman Allocation Standard Deviation for Proportions
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Apr 6, 2016 at 15:29 | vote | accept | Cian Murphy | ||
| Apr 6, 2016 at 2:13 | comment | added | Steve Samuels | Sorry, the previous comment omitted some square roots. $s_h =\sqrt{p_h(1−p_h)}$ is the standard deviation of a binomial variable with success probability $p_h$. The numerator for stratum h in the document is $N_h\sqrt{ p_h(1−p_h}$ and is therefore correct. $N_h$ is the size of the population in stratum h. You are misreading the term as $n_h\sqrt{ p_h(1−p_h)}$. $\sqrt{p_h (1-p_h)/n_h}$ is the standard error or the estimated $p_h$, not its standard deviation. | |
| Apr 4, 2016 at 7:56 | comment | added | Cian Murphy | Thanks Steve. My confusion though is in calculating sh - for a proportion I generally understood this was √(p)(1-p)/n, but here it seems to be √n(p)(1-p). Sure I'm missing something obvious, but just can't spot it! | |
| Mar 31, 2016 at 17:01 | history | answered | Steve Samuels | CC BY-SA 3.0 |