
Hello.
I'm trying to compute median for a filtered column based on other column but there was something wrong. I'll show how I did step by step.
Here's the data:
     a     b     c      class

1   12   0      90     A-B2   3     97    11     A-B3   78   NA    123   A-C4   NA   NA    12    A-C5   8     33     2     A-B6   12   NA     0     A-D
On the command I typed:
1) data = read.csv("data.csv")

2) a.AC <- subset(data, class == "A-C", select = a)
3) median(a.AC)Error in median.default(a.AC) : need numeric data
4) is.numeric(a.AC)FALSE
5) as.numeric(a.AC)Error: (list) object cannot be coerced to type 'double'
How can I fix this? Please help.
Cheers,Suhaila 		 	   		  
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