SQL Clone
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


Pascals Triangle, Home Work and Root Cause Analysis


Pascals Triangle, Home Work and Root Cause Analysis

Author
Message
Dave Poole
Dave Poole
SSCoach
SSCoach (16K reputation)SSCoach (16K reputation)SSCoach (16K reputation)SSCoach (16K reputation)SSCoach (16K reputation)SSCoach (16K reputation)SSCoach (16K reputation)SSCoach (16K reputation)

Group: General Forum Members
Points: 16958 Visits: 3403
Comments posted to this topic are about the item Pascals Triangle, Home Work and Root Cause Analysis

LinkedIn Profile
www.simple-talk.com
paul s-306273
paul s-306273
Hall of Fame
Hall of Fame (3.5K reputation)Hall of Fame (3.5K reputation)Hall of Fame (3.5K reputation)Hall of Fame (3.5K reputation)Hall of Fame (3.5K reputation)Hall of Fame (3.5K reputation)Hall of Fame (3.5K reputation)Hall of Fame (3.5K reputation)

Group: General Forum Members
Points: 3517 Visits: 1169
Excellent article.

Even better, I see you used to work in Manchester!


Paul.
Manchester,UK.
Carla Wilson-484785
Carla Wilson-484785
SSCrazy
SSCrazy (2.3K reputation)SSCrazy (2.3K reputation)SSCrazy (2.3K reputation)SSCrazy (2.3K reputation)SSCrazy (2.3K reputation)SSCrazy (2.3K reputation)SSCrazy (2.3K reputation)SSCrazy (2.3K reputation)

Group: General Forum Members
Points: 2290 Visits: 1951
I enjoyed your article because it was relevant on multiple levels. Thank you for a well-written article!
eephus101
eephus101
SSC Rookie
SSC Rookie (46 reputation)SSC Rookie (46 reputation)SSC Rookie (46 reputation)SSC Rookie (46 reputation)SSC Rookie (46 reputation)SSC Rookie (46 reputation)SSC Rookie (46 reputation)SSC Rookie (46 reputation)

Group: General Forum Members
Points: 46 Visits: 348
Hi David,

This is fantastic! I can find many uses for this..


Thanks!

John R
sknox
sknox
SSCarpal Tunnel
SSCarpal Tunnel (4.1K reputation)SSCarpal Tunnel (4.1K reputation)SSCarpal Tunnel (4.1K reputation)SSCarpal Tunnel (4.1K reputation)SSCarpal Tunnel (4.1K reputation)SSCarpal Tunnel (4.1K reputation)SSCarpal Tunnel (4.1K reputation)SSCarpal Tunnel (4.1K reputation)

Group: General Forum Members
Points: 4061 Visits: 2932
Good article.

Of course, the point you omitted is how the actual probability of any given failure alters the calculations.

With the lottery example, because each of the numbers is (supposedly) equally likely to be chosen, Pascal's triangle is a perfect model, and shows the true (im)probability of winning.

With the car example, QA testing ensures that parts generally have a much higher probability of working than failing, thus although there's only one way for the whole system to work perfectly, it's more likely than the millions of ways it can fail.
Dave Poole
Dave Poole
SSCoach
SSCoach (16K reputation)SSCoach (16K reputation)SSCoach (16K reputation)SSCoach (16K reputation)SSCoach (16K reputation)SSCoach (16K reputation)SSCoach (16K reputation)SSCoach (16K reputation)

Group: General Forum Members
Points: 16958 Visits: 3403
Yes, and apparently each space shuttle launch expected at least 6000 components to fail but was still designed to work.

On my list of things not to think about is precisely how fast a piece of metal moves inside a motor-bike engine when it's between your legs:-P

LinkedIn Profile
www.simple-talk.com
Dave Poole
Dave Poole
SSCoach
SSCoach (16K reputation)SSCoach (16K reputation)SSCoach (16K reputation)SSCoach (16K reputation)SSCoach (16K reputation)SSCoach (16K reputation)SSCoach (16K reputation)SSCoach (16K reputation)

Group: General Forum Members
Points: 16958 Visits: 3403
Joe, I should have remembered that. I think one of your books mentioned storing a calendar table rather than trying to workout calendar maths on the fly.

It is so easy to forget that storing a few thousand records for utility sets costs next to nothing but delivers one hell of a lot of utility

LinkedIn Profile
www.simple-talk.com
richard.rabe
richard.rabe
SSC Rookie
SSC Rookie (32 reputation)SSC Rookie (32 reputation)SSC Rookie (32 reputation)SSC Rookie (32 reputation)SSC Rookie (32 reputation)SSC Rookie (32 reputation)SSC Rookie (32 reputation)SSC Rookie (32 reputation)

Group: General Forum Members
Points: 32 Visits: 51
Thanks for the great article. It reminds me of why when I used to fly airplanes my instructor kept telling me that the probability of an engine failure in a twin engine plane was twice as high as a single... of course you still had one engine running in a twin.

do it right, or do it over and over, it's up to you
pmcpherson
pmcpherson
SSC-Enthusiastic
SSC-Enthusiastic (155 reputation)SSC-Enthusiastic (155 reputation)SSC-Enthusiastic (155 reputation)SSC-Enthusiastic (155 reputation)SSC-Enthusiastic (155 reputation)SSC-Enthusiastic (155 reputation)SSC-Enthusiastic (155 reputation)SSC-Enthusiastic (155 reputation)

Group: General Forum Members
Points: 155 Visits: 476
Don't you also need to make sure that @n <> @r so you don't divide by 0? And @r <> 0 either.
Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum

































































































































































SQLServerCentral


Search