Event size
Event size, here, is the number of Iran Monitor included fatalities linked to one event record (IRM-E). It is derived from the event–person links already stored in the live database and is not a stored variable. It is explicitly not a claim about every casualty or death in the corresponding real-world event: it counts only the included fatalities documented in this record.
Live database, data cutoff 26 August 2026. Every figure below is descriptive, with no inferential test, trend claim or causal interpretation. See Analysis overview for scope and limits.
Sizes here refer to event/operational episodes (IRM-E). Where known, discrete operations (IRM-O) are nested below events and are shown in the event dossiers; they are not counted separately in this section. 53 qualifying event records (IRM-E) have at least one linked included fatality, together representing 114 included fatalities. 35 records (66%) are single-person events — exactly one included fatality is linked to the record — and 18 records (34%) are multi-person events, with two or more linked included fatalities. The mean event size is 2.2 included fatalities per event, the median is 1, and the largest record has 18. No event record lacked a valid positive size.
View data table — exact size distribution
| Included fatalities per event | Event records (IRM-E) | Share of records |
|---|---|---|
| 1 | 35 | 66% |
| 2 | 9 | 17% |
| 3 | 4 | 7.5% |
| 4 | 2 | 3.8% |
| 5 | 0 | 0% |
| 6 | 0 | 0% |
| 7 | 0 | 0% |
| 8 | 0 | 0% |
| 9 | 1 | 1.9% |
| 10 | 0 | 0% |
| 11 | 0 | 0% |
| 12 | 0 | 0% |
| 13 | 0 | 0% |
| 14 | 1 | 1.9% |
| 15 | 0 | 0% |
| 16 | 0 | 0% |
| 17 | 0 | 0% |
| 18 | 1 | 1.9% |
| All valid records (single 35 · multi 18) | 53 | 100% |
Event size over time
| Period | Event records (IRM-E) | Single-person | Multi-person | Multi-person % | Included fatalities | Mean size | Median size | Maximum size |
|---|---|---|---|---|---|---|---|---|
| 1990–1999 | 1 | 1 | 0 | 0% | 1 | 1.0 | 1 | 1 |
| 2000–2009 | 0 | 0 | 0 | — | 0 | — | — | — |
| 2010–2019 | 3 | 2 | 1 | 33.3% | 6 | 2.0 | 1 | 4 |
| 2020–2026 | 49 | 32 | 17 | 34.7% | 107 | 2.2 | 1 | 18 |
| All periods | 53 | 35 | 18 | — | 114 | — | — | — |
Descriptive comparison between responsible actors
This is a descriptive comparison only. To avoid counting one event record more than once, an event contributes to an actor row only when exactly one distinct derived actor is recorded for it. 2 records with more than one derived actor are excluded from the actor rows, because the database does not record a primary actor. The actor rows therefore do not sum to all event records. Where a row rests on very few events the figures are unstable, and no test of difference is performed or implied.
| Actor | Event records (IRM-E) | Included fatalities | Single-person | Multi-person | Multi-person % | Mean size | Median size | Maximum size |
|---|---|---|---|---|---|---|---|---|
| Israel | 37 | 79 | 22 | 15 | 40.5% | 2.1 | 1 | 14 |
| United States / Israel | 9 | 9 | 9 | 0 | 0% | 1.0 | 1 | 1 |
| Islamic State / armed opponents | 1 | 1 | 1 | 0 | 0% | 1.0 | 1 | 1 |
| Syrian actor / exact perpetrator disputed | 1 | 1 | 1 | 0 | 0% | 1.0 | 1 | 1 |
| Syrian rebel forces | 1 | 1 | 1 | 0 | 0% | 1.0 | 1 | 1 |
| Taliban forces | 1 | 1 | 1 | 0 | 0% | 1.0 | 1 | 1 |
| United States | 1 | 2 | 0 | 1 | 100% | 2.0 | 2 | 2 |
| Single-actor records | 51 | 94 | 35 | 16 | — | — | — | — |
Largest events (IRM-E)
| Event record (IRM-E) | Reference date | Derived actor(s) | Included fatalities |
|---|---|---|---|
| 2026 opening strike — senior leadership / intelligence IRM-E-0027 | 2026-02-28 | Israel, United States / Israel | 18 |
| 2025 opening strike — senior command IRM-E-0014 | 2025-06-13 | Israel | 14 |
| 2025 opening strike — nuclear scientists IRM-E-0013 | 2025-06-13 | Israel | 9 |
| 2010–2012 Iranian scientist assassination campaign IRM-E-0002 | 2010-01-12 | Israel | 4 |
| 2025 Islamic Revolutionary Guard Corps/Quds Force intelligence strike IRM-E-0016 | 2025-06-15 | Israel | 4 |