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Published on 2009-05-08T15:54:37Z
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If I use relative frequency to estimate the probability of an event, how good is my estimate based on the number of experiments? Is standard deviation a good measure? A paper/link/online book would be perfect.
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If you are an SQL Server Consultant/Trainer involved with Performance Tuning and Query Optimization, I am sure you have faced the following questions many times.
When is statistics updated? What is the interval of Statistics update? What is the algorithm behind update statistics? These are the puzzling…
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If you are an SQL Server Consultant/Trainer involved with Performance Tuning and Query Optimization, I am sure you have faced the following questions many times.When is statistics updated? What is the interval of Statistics update? What is the algorithm behind update statistics? These are the puzzling…
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Most Oracle Applications DBAs and E-Business Suite users understand the importance of accurate database statistics. Missing, stale or skewed statistics can adversely affect performance.
Oracle E-Business Suite statistics should only be gathered using FND_STATS or the Gather Statistics…
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Incremental statistics maintenance was introduced in Oracle Database 11g to improve the performance of gathering statistics on large partitioned table. When incremental statistics maintenance is enabled for a partitioned table, oracle
accurately generated global level statistics by aggregating…
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There was huge interest in our OOW session last year on Managing Optimizer Statistics. It seems statistics and the maintenance of them continues to baffle people. In order to help dispel the mysteries surround statistics management we have created a two part white paper series on Optimizer statistics…
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I'm coding a board game where there is a bag of possible pieces. Each turn, players remove randomly selected pieces from the bag according to certain rules.
For my implementation, it may be easier to divide up the bag initially into pools for one or more players. These pools would be randomly selected…
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A friend of mine asked: if I have two dice and I throw both of them, what is the most frequent sum (of the two dice' numbers)?
I wrote a small script:
from random import randrange
d = dict((i, 0) for i in range(2, 13))
for i in xrange(100000):
d[randrange(1, 7) + randrange(1, 7)] += 1
print…
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If I use relative frequency to estimate the probability of an event, how good is my estimate based on the number of experiments? Is standard deviation a good measure? A paper/link/online book would be perfect.
http://en.wikipedia.org/wiki/Frequentist
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For when you really do need randomness
Probability - Math - Event - Teaching Resources - Past Events
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This MSDN article proves the correctness of Reservoir Sampling algorithm as follows:
Base case is trivial. For the k+1st
case, the probability a given
element i with position <= k is in R
is s/k.
The probability i is replaced is the probability k+1st element is chosen multiplied by i being…
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