Program freshness
How much of a conference's program is new. Talks the same person or company gave recently somewhere else count against it, more so the more recent they are. So do speakers on a tight loop of the same circuit, and programs dominated by one company. So do speakers who are everywhere, including a full roadshow tour: rarity is prized.
Conferences, freshest first
Each conference's latest event in the past 18 months with at least 10 titled talks; roadshow stops in a year are pooled. Reruns: talks given recently elsewhere by the same person or company. Regulars: talks by speakers who spoke at other events in the same circuit in the previous 90 days. Everywhere: talks by speakers at six or more other events within six months either side (a roadshow's other stops count double). Top company: the company giving the largest share of talks.
Most-repeated talks
The same talk by the same person at four or more events within a year, over the past two years.
Speakers with the most range
At least 6 talks in the past 24 months; highest talk freshness, then the most circuits.
| Speaker | Freshness | Talks | Different talks | Circuits |
|---|---|---|---|---|
| Scott Haines | 100 | 11 | 11 | 5 |
| Weimo Liu | 100 | 6 | 6 | 5 |
| Simon Whiteley | 100 | 14 | 14 | 4 |
| Ryan Blue | 100 | 9 | 9 | 4 |
| Suman Debnath | 100 | 9 | 9 | 4 |
| Jesús Barrasa | 100 | 7 | 7 | 4 |
| Lisa Cao | 100 | 7 | 7 | 4 |
| Gabor Szarnyas | 100 | 6 | 6 | 4 |
| Karthik Ranganathan | 100 | 6 | 6 | 4 |
| JB Onofré | 100 | 9 | 9 | 3 |
| Jordan Tigani | 100 | 9 | 9 | 3 |
| Dipti Borkar | 100 | 8 | 8 | 3 |
| Karen Lopez | 100 | 8 | 8 | 3 |
| Colin Zima | 100 | 7 | 7 | 3 |
| Michelle Leon | 100 | 7 | 7 | 3 |
| Allison Wang | 100 | 6 | 6 | 3 |
| Eno Reyes | 100 | 6 | 6 | 3 |
| Madelyn Olson | 100 | 6 | 6 | 3 |
| Reynold Xin | 100 | 6 | 6 | 3 |
| Roy Hasson | 100 | 6 | 6 | 3 |
Speakers repeating themselves most
Same threshold; lowest talk freshness first.
| Speaker | Freshness | Talks | Different talks | Reruns |
|---|---|---|---|---|
| John Davies | 50 | 28 | 8 | 21 |
| Anurag Raj | 51 | 7 | 6 | 6 |
| Sarah James | 51 | 7 | 5 | 5 |
| Ehtisham Zaidi | 53 | 10 | 8 | 8 |
| Russell Miles | 53 | 14 | 4 | 10 |
| Teresa Lopes | 54 | 13 | 5 | 9 |
| Gülçin Yıldırım Jelinek | 54 | 19 | 8 | 11 |
| Jorg Heizenberg | 56 | 11 | 7 | 7 |
| Sally Parker | 57 | 6 | 5 | 4 |
| Seth Friedman | 57 | 15 | 8 | 8 |
| David Tishgart | 58 | 6 | 3 | 3 |
| Mladen Prajdic | 60 | 7 | 3 | 4 |
| Mark Beyer | 61 | 10 | 7 | 6 |
| Lisa Hoving | 61 | 7 | 2 | 5 |
| Radim Marek | 61 | 7 | 3 | 4 |
| Amit Bendor | 61 | 8 | 5 | 5 |
| Jason Medd | 61 | 9 | 8 | 5 |
| Johan Ludvig Brattås | 62 | 18 | 10 | 10 |
| Benni De Jagere | 63 | 37 | 22 | 19 |
| Dr. Pieter Buteneers | 63 | 26 | 11 | 16 |
How freshness is measured
- A talk is one title at one event; titles are compared after removing case, punctuation and prefixes like "Keynote:". Generic sessions (welcome, panel, lightning talks) never count as reruns.
- Rerun: the same title given at an earlier event by the same person or company, weighted by how recent: the same talk three weeks later counts about 0.9, a year later about 0.2.
- Rotation: other events in the same circuit the speaker spoke at in the previous 90 days.
- Rarity: other events the speaker appears at within six months either side, in any circuit, with other stops of the same roadshow counting double. Penalty = 1 − e−n/8.
- Range: a speaker whose talks in the past year spanned two or more other circuits.
- Program freshness (conferences) per talk = 1 − 0.55 × rerun − 0.2 × rotation − 0.25 × rarity penalty, between 0 and 1; a conference's score is 100 × its average × (0.8 + 0.2 × company variety), where company variety is lower when a few companies give most of the talks.
- Talk freshness (speakers) per talk = 1 − 0.75 × rerun − 0.25 × rotation + 0.1 × range: it rewards new material and variety, and doesn't penalize being prolific. A speaker's score is 100 × the average over their talks in the past 24 months.
- Only conferences with published talk titles can be scored, so keynote-only academic events and events without agendas are missing. A talk given under a new title isn't detected as a rerun.