[R] Simple Missing cases Function

Philipp Pagel p.pagel at wzw.tum.de
Tue Apr 19 09:42:20 CEST 2011

On Tue, Apr 19, 2011 at 03:29:08PM +0800, Tim Elwell-Sutton wrote:
> Dear all
> I have written a function to perform a very simple but useful task which I
> do regularly. It is designed to show how many values are missing from each
> variable in a data.frame. In its current form it works but is slow because I
> have used several loops to achieve this simple task. 

Why not use summary?

> foo <- data.frame(a=c(1,3,4,NA), b=c(NA,4,NA,8), c=factor(c('A', NA, 'A', 'B')))
> summary(foo)
       a               b        c    
 Min.   :1.000   Min.   :4   A   :2  
 1st Qu.:2.000   1st Qu.:5   B   :1  
 Median :3.000   Median :6   NA's:1  
 Mean   :2.667   Mean   :6           
 3rd Qu.:3.500   3rd Qu.:7           
 Max.   :4.000   Max.   :8           
 NA's   :1.000   NA's   :2      


Dr. Philipp Pagel
Lehrstuhl für Genomorientierte Bioinformatik
Technische Universität München
Wissenschaftszentrum Weihenstephan
Maximus-von-Imhof-Forum 3
85354 Freising, Germany

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