r - calc mean/std/ci from column -

-

is there package calculate each specific n number, mean/std/ci. in example starting data:

> n = c(0,0,0,0,0,0,0,2,2,2,2,5,5,5,5,8,8,8,8) > s = c(43,23,65,43,12,54,43,12,2,43,62,25,55,75,95,28,48,68,18) > df = data.frame(n, s) > df    n  s 1  0 43 2  0 23 3  0 65 4  0 43 5  0 12 6  0 54 7  0 43 8  2 12 9  2  2 10 2 43 11 2 62 12 5 25 13 5 55 14 5 75 15 5 95 16 8 28 17 8 48 18 8 68 19 8 18

resulting as:

data n mean std ci 0 40   ..  .. 2 30   ..  .. 5 63   ..  .. 8 41   ..  ..

you can use dplyr package.

here's code snippet. note, i'm assuming want build confidence interval using standard normal approximation @ 95% level can make whatever choice like.

n = c(0,0,0,0,0,0,0,2,2,2,2,5,5,5,5,8,8,8,8) s = c(43,23,65,43,12,54,43,12,2,43,62,25,55,75,95,28,48,68,18) df = data.frame(n, s)    df %>%   group_by(n) %>%   summarise(mean = mean(s),             std = sqrt(var(s)),             lower = mean(s) - qnorm(.975)*std/sqrt(n()),             upper = mean(s) + qnorm(.975)*std/sqrt(n()))  source: local data frame [4 x 5]    n     mean      std     lower    upper 1 0 40.42857 17.88721 27.177782 53.67936 2 2 29.75000 27.69326  2.611104 56.88890 3 5 62.50000 29.86079 33.236965 91.76303 4 8 40.50000 22.17356 18.770313 62.22969

Comments

Post a Comment

Popular posts from this blog

c# - Better 64-bit byte array hash -

-
i need hash algorithm produces 64-bit hash code ( long ) fewer collisions string.gethashcode() , fast (no expensive calls cryptographic functions). here's implementation of fnv still shows 3% of collisions after testing 2 million random strings. need number way lower. void main() { const string chars = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz!#@$%^&*()_+}{\":?><,./;'[]0123456789\\"; const int n = 2000000; var random = new random(); var hashes = new hashset<long>(); int collisions = 0; for(int = 0; < n; i++) { var len = random.next(chars.length); var str = new char[len]; (int j = 0; j < len; j++) { str[j] = chars[random.next(chars.length)]; } var s = new string(str); if(!hashes.add(get64bithash( s ))) collisions++; } console.writeline("collision percentage after " + n + " random strings: " + ((doubl
Read more

webrtc - Which ICE candidate am I using and why? -

-
[questions in bold below] i have setup kurento media server 5.1.3 in datacenter behind firewall running os ubuntu 14.04. has 2 network cards: 222.222.222.222 (eth0 - private ip) 111.111.111.111 (eth1 - public ip) attached below sdp (setremotedescription) when browser connected kurento media server type: answer, sdp: v=0 o=- 5487318114793304426 0 in ip4 0.0.0.0 s=kurento media server c=in ip4 0.0.0.0 t=0 0 a=group:bundle audio video m=audio 59068 rtp/savpf 111 0 c=in ip4 111.111.111.111 a=rtpmap:111 opus/48000/2 a=rtpmap:0 pcmu/8000 a=sendrecv a=rtcp:59068 in ip4 111.111.111.111 a=rtcp-mux a=ssrc:669011897 cname:user39019747@host-6e83e4c2 a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time a=mid:audio b=as:20 a=ice-ufrag:ymdk a=ice-pwd:lylifk5ueqzpwm91ddj37e a=fingerprint:sha-256 ff:0f:81:8c:41:4e:b4:b6:c6:d8:36:f3:d6:5f:09:fd:5f:af:13:b3:9d:fc:12:66:ac:f3:56:d6:5b:0a:73:5d a=candidate:1 1 udp 2013266431 111.111.111.111 55239 typ host a=candidate:2 1 udp
Read more

php - Zend Framework / Skeleton-Application / Composer install issue -

-
i trying create zend framework application using skeleton in netbeans. when run composer install, following error message: "c:\php\php.exe" "c:\composer\composer.phar" "--ansi" "--no-interaction" "update" "--dev" using deprecated option "dev". dev packages installed default now. loading composer repositories package information updating dependencies (including require-dev) requirements not resolved installable set of packages. problem 1 - package requires php >=5.5 php version (5.4.42) not satisfy requirement. problem 2 - installation request zendframework/zendframework 2.5.1 -> satisfiable zendframework/zendframework[2.5.1]. - zendframework/zendframework 2.5.1 requires php >=5.5 -> php version (5.4.42) not satisfy requirement. done. apparently, zend framework only needs php 5.3+ contradicts above. need use php 5.4. my composer.json following: { "name": "
Read more