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REVISION: The Cause of Universality in Growth Fluctuations

July 6, 2011 by J Doyne Farmer   Comments (0)

Phenomena as diverse as breeding bird populations, the size of U.S. firms, money invested in mutual funds, the GDP of individual countries and the scientific output of universities all show unusual but remarkably similar growth fluctuations. The fluctuations display characteristic features, including double exponential scaling in the body of the distribution and power law scaling of the standard deviation as a function of size. To explain this we propose a remarkably simple additive replication

REVISION: The Cause of Universality in Growth Fluctuations

July 6, 2011 by J Doyne Farmer   Comments (0)

Phenomena as diverse as breeding bird populations, the size of U.S. firms, money invested in mutual funds, the GDP of individual countries and the scientific output of universities all show unusual but remarkably similar growth fluctuations. The fluctuations display characteristic features, including double exponential scaling in the body of the distribution and power law scaling of the standard deviation as a function of size. To explain this we propose a remarkably simple additive replication

REVISION: Supporting Information – The Cause of Universality in Growth Fluctuations

July 6, 2011 by J Doyne Farmer   Comments (0)

Supplementary materials for "The cause of universality in growth fluctuations".

As supplementary materials we provide the following:

In Section 1 we discuss a modification to our model incorporating a constraint over the number of elements. In Section 2 we derive and discuss in detail the logarithmic growth rate distribution arising from our model. In Section 3 we discuss a modification to the model that incorporates correlations in the replication factors of elements belonging to the same gro

LinkedIn Compliance Enforcement Gets Easier For Financial Firms

July 6, 2011 by MoneyScience   Comments (0)

David F. Carr  reports at Wall Street and Technology:

Financial services compliance officers can now enforce pre-approval of LinkedIn profile updates using Actiance Socialite.Financial advisors who want to participate in social networks have been hobbled by regulations such as Financial Industry Regulatory Advisory (FINRA) Regulatory Notice 10-06, which classifies social profiles as "static content" that requires pre-approval prior to publication, just like advertising. Actiance is...