Mapa mental
Data reduction by sampling
Conteúdo do mapa
Data reduction by sampling
REASONS TO CHOOSE SAMPLING?
- • To improve runtime performance
- HOW?
- By estimating models based on a subset of the data.
- Models estimated from a sample may be as accurate as those derived from the full dataset
- (if the sample represents the population adequately)
- Models estimated from a sample may be as accurate as those derived from the full dataset
- By estimating models based on a subset of the data.
- HOW?
- For a more focused analysis
- By selecting groups of related records
- EG
- All the properties in a specific neighbourhood
- EG
- By selecting groups of related records
- • To improve runtime performance
TYPES OF SAMPLES
- Random sampling
- Stratified sampling
- Systematic or 1-in-n sampling
- For non-random (structured) samples
In IBM SPSS Modeler
- Sample node
- Used to select a subset of records for analysis,
- OR to specify a proportion of records to discard
- Sample node
Informações
- Descrição
- Data Mining Mapa Mental sobre Data reduction by sampling, criado por sue san em 09-02-2017.
- Criado por
- sue san
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