Re: [Aus-soaring] Comparing accident rates

2016-03-09 Thread Teal
On 10/03/2016 5:53 PM, Texler, Michael wrote: Not actually true; the degree of difference between groups/cases/whatever that you'll need to to get a statistically significant result (be it for p=.05 or p=.01 or whatever) will depend on the sample size, and on the characteristics of the sample

Re: [Aus-soaring] Comparing accident rates

2016-03-09 Thread Texler, Michael
Thanks Teal, >Not actually true; the degree of difference between groups/cases/whatever that >you'll need to to get a statistically significant result (be it for p=.05 or >p=.01 or whatever) will depend on the sample size, and on the characteristics >of the sample and the population you're draw

Re: [Aus-soaring] perlan

2016-03-09 Thread Mike Borgelt
Yes, he's still around too. Living in Toowoomba. He told us all about his flight over the USSR. Big, brass ones. Mike At 04:12 PM 3/10/2016, you wrote: Wow. My interest was piqued when I saw 'RAF U2'. Got on line and saw an article in the independent.co.uk which names Mr MacArthur. What a f

Re: [Aus-soaring] Comparing accident rates

2016-03-09 Thread Teal
On 10/03/2016 5:05 PM, Texler, Michael wrote: It is always difficult to compare accidents rates for 'rare' events due to the wide 95% confidence intervals. http://www.evanmiller.org/ab-testing/poisson-means.html As mentioned by others, there often needs to be an order of magnitude difference

[Aus-soaring] Comparing accident rates

2016-03-09 Thread Texler, Michael
It is always difficult to compare accidents rates for 'rare' events due to the wide 95% confidence intervals. http://www.evanmiller.org/ab-testing/poisson-means.html As mentioned by others, there often needs to be an order of magnitude difference (i.e. a 10 tenfold increase or decrease of an acc

Re: [Aus-soaring] perlan

2016-03-09 Thread Dave Donald
Wow. My interest was piqued when I saw 'RAF U2'. Got on line and saw an article in the independent.co.uk which names Mr MacArthur. What a fascinating bloke he would be talk to! Sent from Yahoo7 Mail on Android On Thu, 10 Mar, 2016 at 4:00 pm, Mike Cleaver wrote: The figures quoted in th

Re: [Aus-soaring] perlan

2016-03-09 Thread Mike Cleaver
The figures quoted in the article are the officially admitted FAI records they hold. Unofficially higher flights were " classified " information, but the F4 Phantom did a zoom climb to 104,000 ft at least once. Wombat Sent from Wombat's iPad > On 10 Mar 2016, at 12:48, Mike Borgelt > wrote:

Re: [Aus-soaring] perlan

2016-03-09 Thread Mike Borgelt
Apart from the bit about recreational glider pilots avoiding mountain wave, the late model U-2 easily goes straight to 74,000 feet. There was an article in AW&ST about it years ago where they flew an editor from the magazine in a two seater. The A-12 (early single seat version)/SR71 was appare

Re: [Aus-soaring] perlan

2016-03-09 Thread Mike Borgelt
Even the aviation press doesn't always get things right. https://www.flightglobal.com/news/articles/perlan-2-glider-starts-cabin-pressurisation-tests-422970/ Mike Borgelt Instruments - design & manufacture of quality soaring instrumentation since 1978 www.borgeltinstruments.com tel: 07