I'm sure people will want to compare the numbers quarter to quarter, so here's an updated table for the last three quarters.
| Category | q406 | q107 | q207 |
| diaries | 27903 | 22849 | 22691 |
| active Kogs: wrote, recommended, or commented on a diary | 100% (18504) | 100% (16679) | 100% (16540) |
| authors: Kogs who wrote a diary | 36% | 32% | 32% |
| commenters: Kogs who left a comment in a diary | 87% | 86% | 86% |
| recommenders: Kogs who recommended a diary | 65% | 67% | 67% |
| Kogs who returned from the previous quarter | na | 78% | 75% |
| arrived: Kogs who weren't active in the previous quarter | na | 22% | 25% |
| Kogs who left, ie didn't return in the next quarter | 30% | 25% | na |
Both the number of participants and the distribution of participation among writing diaries, recommending diaries, and commenting on diaries stayed remarkably stable from q1 to q2 2007. The fraction of current participants that didn't return, quarter to quarter, went down, while the number of newly arrived participants increased. The total number of diaries, after a decline from q4 2006 to q1 2007, stayed almost even.
The distribution of these activities is shown in the following venn diagram, again produced with the help of an online web service.
The diagram shows that the activity most widely engaged in is recommendation, followed by commenting, and finally writing a dairy, in the same order as the effort required. It is clear that over one in five Kogs was fully engaged, taking part by writing diaries, recommending them, and commenting on them. Well done! Taking a closer look, I was somewhat puzzled by the discrepancy between this data and that reported in my 2006 statistical summary. There, I found that solo commenters were a much larger group than solo recommenders. I think this is likely to be due to the inclusion in the year long summary of front page stories: it would stand to reason that there would be a sizable group of people who choose to only comment on these diaries. Indeed, they may not even notice that the user diaries exist! In future I will have to take these differences into account, and likely produce a more unified summary of both front page and user pages.
Activity in the quarter by week is shown in the following three charts. You can get full size versions by clicking on the thumbnail image.
| Daily Kos Q2 2007 Activity | Participation | Extent of Participation |
 |  |  |
| Graph 1 | Graph 2 | Graph 3 |
Graph 1 - Activity. The number of diaries, the number of active Kogs, the number of recommendations awarded and the number of comments during each week. There were more active participants early in the quarter.
Graph 2 - Participation. The total number of Kogs who participated each week (Active) as well as the number who also participated the previous week ("stayed"), those who hadn't participated in the previous week (arrived), or who participated the previous week but failed to participate in the current week (left).
Graph 3 - Extent of Participation. Active Kogs vs number of active weeks. Participation for from one to four weeks accounted for 49% of Kogs, 5-9 weeks 21%, and 10-13 weeks 30% .
It may be of interest to compare these graphs to those presented for Q1 '06, Q2 '06, Q3 '06, or Q1 '07.
Update [2007-7-29 18:55:0 by jotter]: A quick note on distribution of impact. Although I list the top100 by impact below, it is good to recall that groups is selected from a much longer list of contributors. A lot of the total impact of the site comes from that much larger group. So although 216 diarists get 50% of the impact, the other 50% takes thousands. The 216 are the few speaking to the many "at once", while the thousands are talking to each other in smaller groups. I think it takes both to make this place run. Here's a truncated view into the long list: it is TA impact, so the number of diarists is larger than those who posted just this quarter.
| Rank | TA impact | Total | %Total |
| 1 | 76.83 | 76.83 | 1.4 |
| 12 | 34.24 | 581.9 | 10 |
| 33 | 19.81 | 1114.29 | 20 |
| 68 | 13.12 | 1671.22 | 30 |
| 124 | 7.76 | 2224.97 | 40 |
| 216 | 5.02 | 2784.79 | 50 |
| 357 | 3.21 | 3342.93 | 60 |
| 592 | 1.78 | 3900.13 | 70 |
| 1030 | 0.88 | 4457.52 | 80 |
| 2097 | 0.31 | 5013.81 | 90 |
| 3452 | 0.14 | 5292.38 | 95 |
| 5290 | 0.06 | 5459.46 | 98 |
| 6595 | 0.03 | 5515.19 | 99 |
| 10217 | 0.01 | 5570.88 | 100 |
| 14102 | 0.00 | 5570.88 | 100 |
Finally, here are statistics on the 100 authors with the highest total time adjusted impact (TA impact) at the end of the quarter. Time adjusted impact for each diary is that currently remaining, assuming impact decays exponentially with a half life of 60 days. I also show the rank according to time adjusted impact (TA rank).
For comparison the table includes statistics from just Q2, including the rank from Q2 diary impact (Q2 rank), the total t=0 impact of diaries in Q2 (Q2 impact), the total number of diaries (Q2 diaries), the total recommendations, comments, and connections associated with Q2 diaries, and a number I've labeled "Reach" which is the ratio of total connections to total active Kogs during the quarter. The diarist with the highest impact has received recommendations from, or had comments from, 74% of Kogs active in the quarter. Amazing!
One last column: Q2-TA is the difference between Q2 impact rank and the time adjusted rank, so helps show Kogs who worked more near the beginning of the quarter (- values), or near the end (+values).
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