Ferramenta Gráfico de Lift
Ferramenta Gráfico de Lift
Fluxo de trabalho de exemplo
Esta ferramenta tem um fluxo de trabalho de exemplo. Visite Exemplos de fluxos de trabalho para saber como acessar esse e muitos outros exemplos diretamente do Alteryx Designer.
A ferramenta Gráfico de Lift produz um gráfico de resposta cumulativa capturada e um gráfico de taxa de resposta incremental usados para avaliar visualmente a precisão comparativa de diferentes modelos de classificação binária (sim/não) ao fazer previsões para uma avaliação das implicações econômicas esperadas.
Both of these charts are based on aggregating data into 10 groups (deciles) that are ordered based on the predicted probability of a favorable response for each model, and then comparing this response to what would be expected if the selection of prospects was done randomly. In the case of the cumulative response chart, the chart examines what percentage of the total response that would be obtained if all customers in an organization's database were contacted is obtained by contacting the best 10 percent, 20 percent, and so on based on model predictions. The x (horizontal) axis of the chart is the percentage of the database contacted, while the y (vertical) axis is the percentage of the total response captured by going up to that "best" decile of the database based on the model.
For example, the best 20 percent of prospects based on the model may represent 50 percent of the favorable response that would be obtained if all prospects were contacted. The incremental response rate chart gives the favorable response rate for each of the model-based ordered decile groups in the database. In addition, the tool produces a gains table and measures of the area under the curve and the Gini coefficient to provide overall comparative metrics of the performance of different models when the cumulative captured response chart option is selected, and a table of response rates at different deciles for each model when the incremental response rate option is selected.
Essa ferramenta utiliza a ferramenta R. Vá para OpçõesBaixar ferramentas preditivas e faça login no Portal de Downloads e Licenças da Alteryx para instalar o R e os pacotes usados pela ferramenta R. Visite Baixar e utilizar ferramentas preditivas.
Conectar entradas
The tool requires...
Binary classification models, like the Neural Network tool, Logistic Regression tool, Decision Tree tool, Forest Model tool, Boosted Model tool, Spline Model tool, or Stepwise tool have been unioned together into a single data stream.
An Alteryx data stream or XDF metadata stream that is consistent with the model object (in terms of field names and the field types), and all have the same binary target variable.
Configurar a ferramenta
Configuration Tab
Lift chart type: Select the Total cumulative response chart or the Incremental response rate chart.
True response rate (should be between 0 and 1): Often the database used to construct a predictive model has been "oversampled" to increase the percentage of observations that have one of the two target response categories. By specifying the true (original) response rate of the target variable, the lift chart constructed will account for the oversampling of one level of the target. Se não houver superamostragem, o valor dessa opção deve corresponder à taxa de resposta da base de dados usada para desenvolver o modelo.
Target level (the label for the desired response of the target variable): This option allows for the creation of a lift chart that is consistent with the decision context, and allows for error checking to ensure that the chart created is relevant.
A opção "Nome da amostra" permite a você adicionar um rótulo ao gráfico criado indicando qual amostra no fluxo de dados foi usada para criar o gráfico, ou ainda fornecer outras informações relevantes.
Por fim, defina o número de registros a serem lidos de uma vez para limitar quantos registros são extraídos do fluxo de dados por vez.
Guia "Opções de gráfico"
Plot size: Configure the plot size in either Inches or Centimeters.
Resolução do gráfico: selecione a resolução do gráfico em pontos por polegada: 1x (96 dpi), 2x (192 dpi) ou 3x (288 dpi).
Resoluções mais baixas geram um arquivo menor, melhor para visualização em um monitor.
Resoluções mais altas geram um arquivo maior e com melhor qualidade de impressão.
Base font size (points): Configure the font size.
Visualizar a saída
The output for the tool is an Alteryx Report field that consists of an R-Graph and a Lift/Gains table. These elements can be used to assist in the creation of custom reports.