[R] Data frame with unequal lines per case

[PIKAL Petr]

Hi

You shall consult
?aggregate
to get summaries for groups.

And you shall also consult R-intro manual to learn some basic facts about objects structure and manipulation with them.

And finally you shal also have a look into Posting guide how to construct questions

Regards
Petr


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Pat Jackson
> Sent: Thursday, July 03, 2014 7:46 AM
> To: r-help at r-project.org
> Subject: [R] Data frame with unequal lines per case
>
> Dear R Help list,
>      I have data in a comma delimited format with an unequal number of
> lines per case,  ranging from 1 to 5. Each line contains that
> individual's rating of a televised conference they observed. I'm
> interested in the influence of group size on ratings.
>       My questions: how can I create a data frame that will a) treat
> the group as the unit of analysis and b) permit me to calculate group
> results,  e.g., average ratings per group among those with data (which
> will vary)?
>        The data are formatted like those below (but with commas), which
> contains 3 groups (my unit of analysis). The header is the first row.
> Groupname is alpha (which I'll convert later) and the rest are numeric.
> Number is the number of the individual rater in the group, ranging from
> 1-5.  Rate1 and Rate2 range from 0-7 but my example has a more limited
> range. Male,  female,  white and nonwhite are 1 yes or 0 no.
>
> So I have a maximum of 5 raters in 3 groups.
>
> Is it necessary to create a rectangular data frame with empty lines for
> groups with fewer than 5 raters? How should I do that? Or is there a
> better way? ( I have a lot more cases than provided below. )
>
> Thank you for a referral to apps or a suggested strategy to deal with
> this.
>
> Pat J.
>
> Header:
> Groupname number rate1 rate2 males females white nonwhite
>
> Data:
> Blue 1 3 1 1 0 0 1
> Blue 2 2 3 1 0 1 0
> Orange 1 4 4 0 1 1 0
> Yellow 1 3 2 1 0 1 0
> Yellow 2 5 2 0 1 0 1
> Yellow 3 4 3 1 0 0 1
> Yellow 4 4 2 1 0 1 0
> Yellow 5 2 2 0 1 0 1
>       [[alternative HTML version deleted]]
>
> ______________________________________________
> 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.

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