I asked Grok to do an analysis for me. This was the core of the answer. 

### Per Capita Incidence Rate Calculation
- Transgender rate:
  - Incidence = 7 shooters / 1.5 million transgender people = 0.000004667 shooters per person.
  - Per 100,000 people = 0.000004667 × 100,000 = 0.4667 mass shootings per 100,000 transgender individuals.
- Cisgender rate:
  - Incidence = 5,393 shooters / 328.5 million cisgender people = 0.00001641 shooters per person.
  - Per 100,000 people = 0.00001641 × 100,000 = 1.641 mass shootings per 100,000 cisgender individuals.

### Comparison
- Cisgender vs. Transgender: 1.641 / 0.4667 ≈ 3.52. Cisgender individuals have a per capita rate about 3.5 times higher than transgender individuals.