Please see the R Machine Learning Task View 
(http://cran.r-project.org/web/views/MachineLearning.html) for a 
starting point on decision trees.

On 9/14/2011 7:11 PM, Lorenzo Isella wrote:
> Dear All,
> I am recycling a previous email of mine where I asked some questions 
> about clustering mixed numerical/categorical data. This time I am more 
> into data mining. I am given a set of known statistical indexes {s_i}, 
> i=1,2...N for a N countries. These indexes in general are a both 
> numerical and categorical variables. For each country, I also have a 
> property x_i whose value is known, but that I also would like to be 
> able to predict correctly using a model. This is needed in order to 
> assess the importance of the various indexes in determining {x_i}.
> There are two cases of interest
>
> (1) all the {x_i} are numerical variables, e.g. the average life 
> expectancy
>
> (2) all the {x_i} are categorical variables (e.g. the fact that the 
> country joins treaty A, B or C). This reminds me of discrete choice 
> models.
>
> Any suggestions about how to tackle this problems? In the past I used 
> mclust, but it is limited to all the {s_i} being numerical variables.
>
> I saw an example of the use of glm for predicting binary variables
>
> http://www.ats.ucla.edu/stat/R/dae/probit.htm
>
> which may be relevant for (2). In general I know that some people use 
> Weka for this sort of tasks, but I wonder if I can use R to get a 
> decision tree and a confusion matrix and to be able to predict how the 
> {x_i} would change by varying the value of one statistical index.
> Many thanks for your suggestions
>
> Lorenzo
>
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