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To: for-q-clinton
Nope.

For a symmetric data set (One where negative and positive numbers are possible) the rules are:

In no case do three or fewer points trigger an out of control alarm until you get beyond 2σ.

Three points define a plane to a mathematician, or a line to an engineer, but don't quite suffice for a trend under Western Electric control chart rules.

That being said, I start to watch a process very closely when three consecutive points are on the same area...

37 posted on 10/17/2012 10:03:02 AM PDT by null and void (Day 1366 of our ObamaVacation from reality - Obama, a queer and present danger)

To: null and void

How are negative minutes a possibility? Only positive are possible.

41 posted on 10/17/2012 10:15:41 AM PDT by for-q-clinton (If at first you don't succeed keep on sucking until you do succeed)

To: null and void

How are negative minutes a possibility? Only positive are possible.

42 posted on 10/17/2012 10:17:18 AM PDT by for-q-clinton (If at first you don't succeed keep on sucking until you do succeed)

To: null and void
First time is happenstance.

Second time is coincidence.

Third time is enemy action.

..................... Auric Goldfinger

CA....

45 posted on 10/17/2012 10:46:03 AM PDT by Chances Are (Seems I've found that silly grin again....)

To: null and void
Add in all the presidential campaigns from 1992 forward and what confidence do you have in a trend?
48 posted on 10/17/2012 11:02:55 AM PDT by kitchen (Due to the increased price of ammo, do not expect a warning shot.)

To: null and void
In no case do three or fewer points trigger an out of control alarm until you get beyond 2σ.

That is true if you assume you are starting with an unbiased coin/event etc. If you know there will likely be a bias in the outcome then its a safe bet you don't need more events.

49 posted on 10/17/2012 11:08:40 AM PDT by Raycpa

To: null and void

Please use statistics correctly if you are you going to pretend to use them.

For example, there are not THREE measurements here. There were three debates. Each debate had a number of questions. The measurement to be used is the excess timing for each question.

Second, you have yet to express what the sigma for this event should be. If each candidate has 120 seconds to speak, the excess should be on the order of a few seconds. Accumulating a 180 plus overage during an entire debate is a lot of excess.

You have yet to specify what the sigma is you are using/claiming. I would assert, without doing the math, that a 3 minute overage would be outside the 3 sigma limit where a single occurance is sufficient to show bias.

You are assuming a normal distribution. That may not be a valid assumption for this process.

73 posted on 10/18/2012 7:34:31 AM PDT by Pikachu_Dad (Impeach Sen Quinn)

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