[R] Calculating the mean in one column with empty cells

[PIKAL Petr]

Hi

see inline

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of fxen3k
> Sent: Friday, October 05, 2012 11:28 AM
> To: r-help at r-project.org
> Subject: [R] Calculating the mean in one column with empty cells
> 
> Hi all,
> 
> I recently tried to calculate the mean and the median just for one
> column.
> In this column I have numbers with some empty cells due to missing
> data.
> So how can I calculate the mean just for the filled cells?
> I tried:
> mean(dataSet2$ac_60d_4d_after_ann[!is.na(master$ac_60d_4d_after_ann)],
> na.rm=TRUE)
>

mean(dataSet2$ac_60d_4d_after_ann, na.rm=TRUE)

shall suffice.

 But the output was different to the calculation I died in Microsoft
> Excel.

Hm. I am also sometimes dying from Excel performance.

There could be 2 options:
Excel is wrong
You did not have transferred values from Excel to R correctly, they are screwed somehow.

Which one is true is difficult to decide based on information you revealed.

Regards
Petr


> 
> Thanks in advance,
> Felix
> 
> 
> 
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