Tableau Calculated Fields Library

Create a library of Tableau calculated fields for my visualization project:

Data Context:
- Domain: [industry/use case]
- Key measures: [list primary metrics]
- Key dimensions: [list categories]
- Date field: [field name and granularity]

Calculated Fields Needed:

1. Date/Time Calculations
   - Fiscal year/quarter conversion
   - Week number (ISO/custom)
   - Relative date filters (Last N days/months)
   - Date part extraction

2. String Manipulations
   - Standardize formats
   - Extract components
   - Concatenate with formatting
   - Conditional text

3. Aggregation Variations
   - Running totals
   - Moving averages
   - Percent of total
   - Rank calculations

4. Conditional Logic
   - Binning/bucketing
   - Status classifications
   - Threshold indicators
   - Exception flagging

5. Table Calculations
   - Year-over-year change
   - Difference from average
   - Percentile rank
   - Index calculations

6. LOD Expressions
   - Fixed calculations
   - Include/Exclude patterns
   - Nested LODs

For each calculation provide:
- Formula with comments
- Use case explanation
- Performance considerations
- Example application