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-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of Pat Jackson > Sent: Thursday, July 03, 2014 7:46 AM > To: r-help@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@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. ________________________________ Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům. Jestliže jste obdržel(a) tento e-mail omylem, informujte laskavě neprodleně jeho odesílatele. 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