[vpFREE] Re: how to tell if your machine is fair?

Hi.

Sorry for the triple post.

I found an interesting 2010 paper about "mean time" and "waiting time"
and using it to detect changes in underlying behavior (e.g. a gaffed
game).
http://ff.im/USw3M

So what are the "mean time" and "waiting time" to see a bad streak of
23/200 flushes?
How many hands?

If we have seen 23/200 flushes way too soon, maybe the underlying
machine is "gaffed".

Mitchell

The authors of the papers say "The statistics of waiting time may not
justify the prediction by the gambler's fallacy, but paying
attention to streaks in the hot hand belief appears to be meaningful
in detecting the changes in the underlying process."

The debate over the statistical validity of the hot hand belief has
lasted more than twenty years (e.g., Bar-Eli et al., 2006), and it
is not likely to be ended by simply introducing a new set of
statistics. However, pattern time statistics do seem to support some
of the existing theories.

In particular, it has been suggested that the hot hand belief arises
when people are evaluating human performance, and people pay
particular attention to streak patterns in order to detect a change in
the performance, for example, fluctuations in
the shooting accuracy of basketball players (e.g., Ayton & Fischer,
2004; Burns, 2004; Burns & Corpus, 2004; Sun, 2004).

By such account, the prediction to continue a streak is actually valid
on the basis of a higher probability
of a single outcome (e.g., a higher shooting accuracy, a higher
probability of heads in case of a biased coin).

It can be shown that by the measure of either mean time or waiting
time, streak patterns are indeed a good indicator
for detecting the changes in the probability of single outcomes.

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Re: [vpFREE] Re: how to tell if your machine is fair?

 

> On Apr 18, 2012, at 8:59 AM, matt20482002 wrote:
>> OK, you converted 23 of 200 flushes.
>>

Shorter version of my previous message.

It would be cool to know, if I played 5,000 or 10,000 flush draws, how
likely I am to have a bad streak where only 23/200 flushes connect.
Or...What is the number of flush draws I need to play (e.g. 1,000,
10,000), before I have 50% chance of seeing a bad streak of 23/200 or
worse.

Mitchell

Here's a link I found:

Recently I've come across a task to calculate the probability that a
run of at least K successes occurs in a series of N (K≤N) Bernoulli
trials (weighted coin flips), i.e. "what's the probability that in
50 coin tosses one has a streak of 20 heads?"
http://www.askamathematician.com/2010/07/q-whats-the-chance-of-getting-a-run-of-k-successes-in-n-bernoulli-trials-why-use-approximations-when-the-exact-answer-is-known/

It's messy.

Does any know any links to "bad streaks of 23/200" as opposed to "runs
of 23"?

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