feature selection

  1. A

    Caret package SAF/GAF error; "replacement has 1 row, data has 0"

    In R, whenever I try using the safs/gafs interface via. caret I keep running into this specific error: Error in { : task 1 failed - "replacement has 1 row, data has 0" Here is a link to the data I am using, stored as a .csv file. The .csv file given has a column with the row number which I...
  2. C

    Basic questions from newbie

    Hi, I am currently learning ML algorithms and implementing in R. I have a couple basic questions. 1.)Is dimensionality reduction same as feature selection? I know that in R specifying importance=T parameter in randomForest function gives you the important features based on info.gain.I was...
  3. E

    Identifying relevant predictors and interactions

    I have a data set comprising of 12,000 observations and 1,100 potential predictors (continuous and nominal) for a binary outcome/target variable. The research question is to identify interesting predictors and interactions for the binary outcome/target variable. Given the large number of...
  4. T

    Data Mining Methods with Nested Data

    I have three general questions that I am really struggling to answer: a) When we have nested data (e.g. employees nested in departments which are nested in companies which are in specific geographical regions) how data mining methods adjust to nesting? b) Are data mining methods ""immune""...