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.
________________________________
Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a jsou ur?eny
pouze jeho adres?t?m.
Jestli?e jste obdr?el(a) tento e-mail omylem, informujte laskav? neprodlen? jeho
odes?latele. Obsah tohoto emailu i s p??lohami a jeho kopie vyma?te ze sv?ho
syst?mu.
Nejste-li zam??len?m adres?tem tohoto emailu, nejste opr?vn?ni tento email
jakkoliv u??vat, roz?i?ovat, kop?rovat ?i zve?ej?ovat.
Odes?latel e-mailu neodpov?d? za eventu?ln? ?kodu zp?sobenou modifikacemi ?i
zpo?d?n?m p?enosu e-mailu.
V p??pad?, ?e je tento e-mail sou??st? obchodn?ho jedn?n?:
- vyhrazuje si odes?latel pr?vo ukon?it kdykoliv jedn?n? o uzav?en? smlouvy, a
to z jak?hokoliv d?vodu i bez uveden? d?vodu.
- a obsahuje-li nab?dku, je adres?t opr?vn?n nab?dku bezodkladn? p?ijmout;
Odes?latel tohoto e-mailu (nab?dky) vylu?uje p?ijet? nab?dky ze strany p??jemce
s dodatkem ?i odchylkou.
- trv? odes?latel na tom, ?e p??slu?n? smlouva je uzav?ena teprve v?slovn?m
dosa?en?m shody na v?ech jej?ch n?le?itostech.
- odes?latel tohoto emailu informuje, ?e nen? opr?vn?n uzav?rat za spole?nost
??dn? smlouvy s v?jimkou p??pad?, kdy k tomu byl p?semn? zmocn?n nebo p?semn?
pov??en a takov? pov??en? nebo pln? moc byly adres?tovi tohoto emailu p??padn?
osob?, kterou adres?t zastupuje, p?edlo?eny nebo jejich existence je adres?tovi
?i osob? j?m zastoupen? zn?m?.
This e-mail and any documents attached to it may be confidential and are
intended only for its intended recipients.
If you received this e-mail by mistake, please immediately inform its sender.
Delete the contents of this e-mail with all attachments and its copies from your
system.
If you are not the intended recipient of this e-mail, you are not authorized to
use, disseminate, copy or disclose this e-mail in any manner.
The sender of this e-mail shall not be liable for any possible damage caused by
modifications of the e-mail or by delay with transfer of the email.
In case that this e-mail forms part of business dealings:
- the sender reserves the right to end negotiations about entering into a
contract in any time, for any reason, and without stating any reasoning.
- if the e-mail contains an offer, the recipient is entitled to immediately
accept such offer; The sender of this e-mail (offer) excludes any acceptance of
the offer on the part of the recipient containing any amendment or variation.
- the sender insists on that the respective contract is concluded only upon an
express mutual agreement on all its aspects.
- the sender of this e-mail informs that he/she is not authorized to enter into
any contracts on behalf of the company except for cases in which he/she is
expressly authorized to do so in writing, and such authorization or power of
attorney is submitted to the recipient or the person represented by the
recipient, or the existence of such authorization is known to the recipient of
the person represented by the recipient.