[R] Odp: mean and sd with number of values?

[Petr PIKAL]

Hi

r-help-bounces at r-project.org napsal dne 06.03.2008 17:41:06:

> Hi there,
> 
> When i do 
> 
> mean(fl[1:20], na.rm=T)

e.g.

sum(!is.na(fl[1:20]))

Regards
Petr


> sd(fl[1:20], na.rm=T)
> 
> I get 20 Results, but now I'd like to know from how many numbers my mean
> and sd are calculated.
> 
> How to I use the length() for this, or is this possible?
> 
> Because there are missing values in some, but not in all columns.  So
> there should be a different count of numbers.
> 
> Thanks,
> Martin
> 
> -- 
> Ihr Partner für Webdesign, Webapplikationen und Webspace.
> http://www.roomandspace.com/
> Martin Kaffanke +43 650 4514224
> [příloha signature.asc odstraněna uživatelem Petr PIKAL/CTCAP] 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide 
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.