[R] Unequal column lengths

David Winsemius dwinsemius at comcast.net
Fri Apr 15 02:31:29 CEST 2016

> On Apr 14, 2016, at 2:33 PM, Tom Mosca <tom at vims.edu> wrote:
> Hello,
> I�ve tried several times to learn R, but have never gotten past a particular gate.  My data are organized by column in Excel, with column headers in the first row.  The columns are of unequal lengths.  I export them as CSV, then import the CSV file into R.  I wish to summarize the data by column.  R inserts NA for missing values, then refuses to operate on columns with NA.  R is importing my data into a data frame, and I realize that is inappropriate for what I want to do.
> How can I import my data so that I can work on columns of unequal length?  The first thing I would like to do is generate a table containing mean, median, mode, standard deviation, min, max and count, all per column.

Most of the summary statistic functions have an na.rm options that you should set to TRUE.

> Thank you, Tom
> Example data
>  Dat1 Dat2 Dat3
> 1    1    5    4
> 2    7    7    9
> 3    3    3    5
> 4    2   NA  5
> 5    9   NA NA

Looks like you have an R dataframe already, so I would try(

colMeans(data, na.rm=TRUE)

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David Winsemius
Alameda, CA, USA

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