Teradata Package for R Function Reference | 17.00 - NaiveBayesPredict - Teradata Package for R - Look here for syntax, methods and examples for the functions included in the Teradata Package for R.

NaiveBayesPredict

Description

The NaiveBayesPredict function uses the model output by the NaiveBayes (td_naivebayes_mle) function to predict the outcomes for a test set of data.
Note: This function is only available when tdplyr is connected to Vantage 1.1 or later versions.

Usage

  td_naivebayes_predict_mle (
      formula = NULL,
      modeldata = NULL,
      newdata = NULL,
      id.col = NULL,
      output.prob = FALSE,
      responses = NULL,
      terms = NULL,
      newdata.sequence.column = NULL,
      modeldata.sequence.column = NULL,
      newdata.order.column = NULL,
      modeldata.order.column = NULL
  )

Arguments

formula	Optional Argument. Required when the argument "modeldata" is not an object of "td_naivebayes_mle" class. Specifies a string consisting of "formula" which was used to fit in model data. Only basic formula of the (col1 ~ col2 + col3 +...) form is supported and all variables must be from the same tbl_teradata object. The response should be column of type numeric or logical.
modeldata	Required Argument. Specifies the model tbl_teradata generated by td_naivebayes_mle. This argument can accept either a tbl_teradata or an object of "td_naivebayes_mle" class.
modeldata.order.column	Optional Argument. Specifies Order By columns for "modeldata". Values to this argument can be provided as a vector, if multiple columns are used for ordering. Types: character OR vector of Strings (character)
newdata	Required Argument. Specifies the tbl_teradata object defining the input test data.
newdata.order.column	Optional Argument. Specifies Order By columns for "newdata". Values to this argument can be provided as a vector, if multiple columns are used for ordering. Types: character OR vector of Strings (character)
id.col	Required Argument. Specifies the name of the column that contains the ID that uniquely identifies the test input data. Types: character
output.prob	Optional Argument. Specifies whether to output probabilities. Default Value: FALSE Types: logical
responses	Optional Argument. Specifies a list of responses to output. Note: This argument is required when connected to Vantage prior to Vantage 1.1.1. Types: character OR vector of characters
terms	Optional Argument. Specifies the names of input tbl_teradata columns to copy to the output tbl_teradata. Types: character OR vector of Strings (character)
newdata.sequence.column	Optional Argument. Specifies the vector of column(s) that uniquely identifies each row of the input argument "newdata". The argument is used to ensure deterministic results for functions which produce results that vary from run to run. Types: character OR vector of Strings (character)
modeldata.sequence.column	Optional Argument. Specifies the vector of column(s) that uniquely identifies each row of the input argument "modeldata". The argument is used to ensure deterministic results for functions which produce results that vary from run to run. Types: character OR vector of Strings (character)

Value

Function returns an object of class "td_naivebayes_predict_mle" which is a named list containing object of class "tbl_teradata".
Named list member can be referenced directly with the "$" operator using name: result.

Examples

  
    # Get the current context/connection
    con <- td_get_context()$connection

    # Load example data.
    loadExampleData("naivebayes_predict_example", "nb_iris_input_test", "nb_iris_input_train")

    # Create object(s) of class "tbl_teradata".
    nb_iris_input_train <- tbl(con, "nb_iris_input_train")
    nb_iris_input_test <- tbl(con, "nb_iris_input_test")

    # Example 1 - Using NaiveBayes model in td_naivebayes_predict_mle() function.
    # Generate NaiveBayes model based on train data "nb_iris_input_train".
    naivebayes_train1 <- td_naivebayes_mle(formula = (species ~ petal_length + sepal_width +
                                                                petal_width + sepal_length),
                                           data = nb_iris_input_train
                                           )

    # Use the generated model to predict the 'species' on the test data "nb_iris_input_test".
    td_naivebayes_predict_mle_out1 <- td_naivebayes_predict_mle(modeldata = naivebayes_train1,
                                               newdata = nb_iris_input_test,
                                               id.col = "id",
                                               output.prob = FALSE,
                                               responses = c("virginica", "setosa", "versicolor")
                                               )

    # Example 2 - Using NaiveBayes model's tbl_teradata object in td_naivebayes_predict_mle()
    # function.
    # Use tbl_teradata object of the model generated (in Example 1) to predict the 'species' on
    # the test data nb_iris_input_test.
    # The 'formula' argument is required when 'modeldata' takes tbl_teradata object instead of
    # td_naivebayes_mle object.
    td_naivebayes_predict_mle_out2 <- td_naivebayes_predict_mle(
                                             modeldata = naivebayes_train1$result,
                                             newdata = nb_iris_input_test,
                                             id.col = "id",
                                             output.prob = FALSE,
                                             responses = c("virginica", "setosa", "versicolor"),
                                             formula = (species ~ petal_length + sepal_width +
                                                                  petal_width + sepal_length)
                                             )