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Friday, September 26, 2008

Golden ratio

Here is a simple quick SAS program to calculate the golden ratio, after 70 steps it reaches 1.6180339885, which is pretty close to the true solution.

 

data phi;

phi1=1;

phi2=(phi1+1)/phi1;

incr=.1;

output;

do i=2 to 70;

    if phi1<phi2 then phi1+incr;

    else do;

        phi1+(-incr);

        incr=incr/10;

    end;

    phi2=(phi1+1)/phi1;

    output;

end;

run;

Thursday, September 25, 2008

Kelly leaving

Ruth Kelly's explanation to leave because of her four children sounds
really stupid because why she didn't quit politics much earlier?
Surely she didn't realize suddenly she had children.

Sent from my iPhone

Tuesday, September 23, 2008

Google G1

T-Mobile will announce the new iPhone rival today: the G1 phone running on Google's android operating system

http://announcement.t-mobileg1.com/

It's said to launch in the UK in December. 

Monday, September 22, 2008

Oil

The oil market is one of the most discussed themes and yet there are more things we don't know than thing things we do know. Let's look at some features which describe this market
  • Resource constraint, supply is limited
  • Huge initial investment required with high risk of failure
  • Self-regulated oligopoly on the seller side and buyer side (oligopsony?)
  • Huge exogenous effects (crises etc)
  • Unpredictability of future price
  • Low price elasticity

Sunday, September 21, 2008

Brown needs to wake up

Just watching Brown on Sunday AM, he seems delusional about reality.
He is refering to the US all the time. Nothing is his fault but he
brought the success of the last decade. He doesn't realise people
don't care about the US, China, but about paying their bills, which he
is not helping them with.

Sent from my iPhone

Tuesday, September 09, 2008

Test for multi-modality

Do you know of a simple test for multi modality? Do you use the Silverman test? 

Gauss 9

Aptech have released version 9 of GAUSS, it features multi threading to make code run quicker.