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Sequence 134 — T7 - selection, filtering and missing values
Context: Technology Gate B - Programmatic Data Management | Technology Gate
Source: CDMP Master Execution Manual
When / purpose
Use pandas for controlled inspection.
What you should learn
- Column/row selection.
- Boolean filtering.
- isna/notna.
- Business meaning before filling/dropping.
Resources / limits
Technology Competency Roadmap: active T6–T10 only. Detailed Technology Competency Reference: topic detail/readiness only.
Do this in order
- Find missing values.
- Filter exceptions.
- Explain why automatic fill/drop could destroy evidence.
Meridian application
Use Meridian synthetic files and database only for bounded practice.
Create / save
Missingness analysis.
Stop / boundary
Stop before production data engineering, application development, advanced OOP, orchestration or distributed processing.
Completion gate
You can identify and interpret missingness without changing raw input.
NEXT → Sequence 135
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