R help - Sep 2006 - looking for some functions to analyze a data set.

Hi R-users
I have a data set. There are 10 products and the numbers of people who 
ranked the products.

The format of the data set is

productID   rank1 rank2 rank3 rank4 rank5 rank6 rank7 rank8 rank9 rank10
-------------------------------------------------------------------------------------------------------
1                 10
2                  3
3                  6
4                  2
5                24
6                  8
7                  3
8                  8
9                  4
10                5

Each cell has the number of people who ranked the product. For example, 4 
people who ranked 9th product best.

I would like to know how to summarze this data using some R functions. My 
goal is to figure out what is the best product based on the ranking 
information.

Easy one is to look at only rank1 column, then I do not utilize all 
information the data have.
I can also do this. For each product, the number of people * rank scores and 
then pick lowest number for the best product.

Is there any other way I can summarize this data?

Any suggestion for R fundtions or statistical methos will be appreciated.

Taka,

_________________________________________________________________
Get today's hot entertainment gossip  http://movies.msn.com/movies/hotgossip

You could use the weighted mean (?weighted.mean) or weighted median
(?wtd.quantile in package Hmisc).

On 9/19/06, Taka Matzmoto <sell_mirage_ne at hotmail.com>
wrote:
> Hi R-users
> I have a data set. There are 10 products and the numbers of people who
> ranked the products.
>
> The format of the data set is
>
> productID   rank1 rank2 rank3 rank4 rank5 rank6 rank7 rank8 rank9 rank10
>
-------------------------------------------------------------------------------------------------------
> 1                 10
> 2                  3
> 3                  6
> 4                  2
> 5                24
> 6                  8
> 7                  3
> 8                  8
> 9                  4
> 10                5
>
> Each cell has the number of people who ranked the product. For example, 4
> people who ranked 9th product best.
>
> I would like to know how to summarze this data using some R functions. My
> goal is to figure out what is the best product based on the ranking
> information.
>
> Easy one is to look at only rank1 column, then I do not utilize all
> information the data have.
> I can also do this. For each product, the number of people * rank scores
and
> then pick lowest number for the best product.
>
> Is there any other way I can summarize this data?
>
> Any suggestion for R fundtions or statistical methos will be appreciated.
>
> Taka,
>
> _________________________________________________________________
> Get today's hot entertainment gossip 
http://movies.msn.com/movies/hotgossip
>
> ______________________________________________
> R-help at stat.math.ethz.ch 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.
>

Taka Matzmoto <sell_mirage_ne <at> hotmail.com> writes:
> Hi R-users
> I have a data set. There are 10 products and the numbers of people who 
> ranked the products.
.......
> 
> Is there any other way I can summarize this data?
Be sure to know what assumptions are implicit in the procedures you are using to
do this. Any procedure you use will violate some assumption that seems quite
intutively appealing. Anupam.