[Fis] MAXENT applied to ecology

2014-09-27 Thread John Collier
List,

I am curious what people think of this.

http://www.wired.com/2014/09/information-theory-hold-key-quantifying-nature/

From the article:

MaxEnt is based on principles of simplicity and consistency, but it has 
additional assumptions baked into it, starting with the fact that researchers 
must choose just a few variables to feed into the procedure. In 2008, when 
Harte first considered the idea, he decided to try it out using the size of an 
area, the number of species there, the number of individuals, and the total 
metabolic rate of all those organisms. He didnt pick these characteristics at 
random; he had an inkling, from reading work on metabolic theory, that these 
had promise for describing biological systems. In some cases, they do very well.

The simplification of a complex ecosystem into just a handful of variables has 
fueled criticisms of MaxEnt, because it assumes that those numbers and whatever 
processes generate them are the only things shaping the environment. In 
essence, it generates predictions of biodiversity without taking into account 
how that diversity arises. It implies that the details many ecologists focus on 
might not matter if you want to understand the larger patterns of an ecosystem. 
Harte said he usually gets two responses: Youve opened up a whole new theory, 
and youre an idiot, because we all know that mechanism matters in ecology.


Other extrapolation methods are mentioned in the article that I am also curious 
about.

John



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Re: [Fis] [Fwd: information.energy] Joseph Brenner

2014-09-27 Thread John Collier
Catching up on old mail since I have been dealing with visa and banking issues 
(someone got into my account the old way with phone calls and faxes and stole 
$650). Nothing is resolved yet, but I have some spare time from these grueling 
necessities.

First: All energy has form. Without differences energy would just be a uniform 
0. So matter and energy do not differ in this respect.

Second: In sufi (Islamic mystics) tradition the first mane of God is Hu. It is 
an aspiration cutting off silence from noise. All the names of God have an 
icon9ic sound (Allah is a downthrust from the head to the heart and back to the 
head). A friend of mine who had studied with sufis for some time and was also a 
mathematician familiar with information theory suggested that this was the 
first distinction from which all others emerge, basically the distinction 
between something and nothing. This is in line with the sufi tradition. We can 
find sufi influences in the rationalist philosophy of both Spinoza and Leibniz. 
Leibniz, of course, is known for his attempt to found existence on distinction.

Third: I suspect that information and energy are the same at a very basic 
level, but they can become separated. Information is more closely tied to 
boundary conditions, which guide energy (and all change, as it turns out). 
These can be decoupled to a greater or lesser degree. Once we get to biology 
there is a strong decoupling, as I have argued numerous times elsewhere in 
connection with my work with Brooks and Wiley in the 80s, and the energy and 
information budgets are thus also decoupled, though never entirely separated. 
To prove this the common dimensional grounds of information and energy need to 
be established. I think that dimensional analysis gives us an  equivalence by 
way of temperature, which is average kinetic energy per degree of freedom. 
Using Brillouin's characterization of information in terms of the complement of 
entropy, it works out that information has dimensions of degrees of freedom, 
which makes some sense.

John


At 10:13 AM 2014-09-09, Pedro C. Marijuan wrote:


- Original Message -
From: Joseph Brennermailto:joe.bren...@bluewin.ch
To: Stanley N Salthemailto:ssal...@binghamton.edu ; 
fismailto:fis@listas.unizar.es ; Robert Ulanowiczmailto:u...@umces.edu
Sent: Monday, September 08, 2014 6:01 PM
Subject: Re: [Fis] information.energy

Dear Stan, Bob and All,

This was a very interesting thread which I feel is worth coming back to. First 
of all, I see the attitudes of Stan and Bob as not mutually exclusive but 
complementary. What 'history' means in the 'dim region' where it all began is 
pretty dim. Second, I agree with Stan's formulation that information implies 
more than one entity. This suggests to me that it, like energy, is a dualism, 
sharing some of the dualistic properties of that dim region, somwhere  between 
what is and, to use Arthur Eddington's phrase, what is not.

Please do not ask me if and how the above idea can be proven. I consider it as 
worth mentioning in the context of the foundations of information science 
because it leaves the door open to the complexities and contradictions of 
information you much earlier and later I have been struggling with.

It is even possible that Peirce's notions of Firstness and Secondness could be 
related to the above. The problems with these notions would be, then, a 
consequence of his trying to keep them separate to avoid contradictions, which 
he did not like.

Best regards,

Joseph

- Original Message -
From: Stanley N Salthemailto:ssal...@binghamton.edu
To: fismailto:fis@listas.unizar.es
Sent: Monday, August 04, 2014 4:21 PM
Subject: Re: [Fis] information.energy
Bob -- Note that I was pointing out a sense in which information implies 
something different from energy -- especially in the context of dialectics, 
which is the basis of Joseph's approach. There can be no 'precipitated' energy 
(matter) without some kind of form, realizing one or some constraints, but the 
concept of information (its history) tends to imply interaction.
STAN
On Sun, Aug 3, 2014 at 11:13 PM, Robert E. Ulanowicz 
u...@umces.edumailto:u...@umces.edu wrote:
 Stanley N Salthe ssal...@binghamton.edumailto:ssal...@binghamton.edu
 9:32 AM (0 minutes ago)
 to Joseph
 Joseph -- Commenting on:
 ...
 Is there not also a sense that information implies more than one entity
 (sender-receiver, object-interpreter)? That too would tend to align with
 the idea of energy being primary.
But Stan, you were one of the first to recognize the broader nature of
information as constraint. It is also inherent in structure (Collier's
enformation). Hence, wherever inhomogeneities exist, so does information
-- an argument for a common origin. Bob



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