Neighbourhood Pool Watch: 14th October weekly pool statistics

I hope everyone got some use out of the Variable pool difficulty post. If anything's not clear, please post a comment or contact me with your questions.

Most pools lost some percentage of the network hashrate this week - BTCGuild and Bitminter were the only pools to experience a continuation of hashrate increase.

If there's significant (successful) pool hopping going on at Deepbit it's being hidden by the general variation in pool hashrate there at the moment. Pool hopping at slush's pool has reduced significantly.

There is something odd happening with my calculations of BTCGuild's luck - the shares per round I'm estimating is far too high. I'll try to figure out how to fix it this week.

Two unexpectedly large donations over the last fortnight - thank you very much to my mysterious benefactors! Smaller donations are just as welcome though: 12QxPHEuxDrs7mCyGSx1iVSozTwtquDB3r

Average hashrate:

Average hashrate = Total shares / Total round time

Luck index:

log(% of network blocks solved / % of network hashrate)

Luck index = 0 is average luck

Luck index > 0 is good luck

Luck index < 0 is poor luck

Weekly average round length as a fraction of difficulty:

Average number of shares submitted per round / difficulty

Figure 1: Table of all pools with public data and their various statistics averaged for the last seven days - for smaller pools the average may be more or less than seven days, depending on number of blocks solved for the week.

Figure 2: Chart of network hashrate, hashrate of the largest mining pool, combined hashrates of the three largest mining pools, and a line representing 50% of the network hashrate. Handy if you're worried about 51% attacks.

Figure 3: Chart of chronology of pool hashrates, averaged per week.

Figure 4: Chart of average hashrates per pool per round for the week.
Figure 5: Chart of chronology of negative binomial CDF probability of shares submitted and blocks produced for the week.
Figure 6: Chart of chronology of pool luck indexes, averaged per week.
Figure 7: Chart of chronology of round length divided by difficulty, averaged per week.
Figure 8: Chart of percentage of orphaned blocks produced by the pool, averaged per week.
Figure 9: Chart of hashrate vs round length for hoppable pools (the larger the hashrate increase at the start of a round, the larger the loss to strategic miners).