TY - JOUR

T1 - Debates

T2 - Does Information Theory Provide a New Paradigm for Earth Science? Sharper Predictions Using Occam's Digital Razor

AU - Weijs, Steven V.

AU - Ruddell, Benjamin L.

N1 - Funding Information:
This work was funded by a NSERC Discovery Grant of S. V Weijs and the U.S. National Science Foundation Macrosystems Biology (MSB) program Award EF1241960, a new theory and data product quantifying ecosystem sensitivity to climate change. No numerical data were used for this paper. The findings are those of the authors and not necessarily those of the funding agencies. The authors gratefully acknowledge discussions within the GeoInfoTheory community (www.geoinfotheory.org) at recent workshops, as well as helpful review comments by Shervan Gharari and one anonymous reviewer.
Publisher Copyright:
©2020. American Geophysical Union. All Rights Reserved.

PY - 2020/2/1

Y1 - 2020/2/1

N2 - Occam's Razor is a bedrock principle of science philosophy, stating that the simplest hypothesis (or model) is preferred, at any given level of model predictive performance. A modern restatement often attributed to Einstein explains, “Everything should be made as simple as possible, but not simpler.” Using principles from (algorithmic) information theory, both model descriptive performance and model complexity can be quantified in bits. This quantification yields a Pareto-style trade-off between model complexity (length of the model program in bits) and model performance (information loss in bits, or the missing information, needed to describe the original observations). Model complexity and performance can be collapsed to one single measure of lossless model size, which, when minimized, leads to optimal model complexity versus loss trade-off for generalization and prediction. Our view puts both simple data-driven and complex physical-process-based models on a continuum, in the sense that both describe patterns in observed data in compressed form, with different degrees of generality, model complexity, and descriptive performance. Information theory-based assessment of compression performance with fair and meaningful accounting for model complexity will enable us to best compare and combine the strengths of physics knowledge and data-driven modeling for a given problem, given the availability of data. “Suppose we draw a set of points on paper in a totally random manner” …. “I am saying it is possible to find a geometric line whose notation is constant and uniform, following a certain law, that will pass through all points, and in the same. order they were drawn.” … “But if that law is strongly composed,. the thing that conforms to it should be seen as irregular”Gottfried Wilhelm Leibniz, 1686: Discours de métaphysique V, VI (from French).

AB - Occam's Razor is a bedrock principle of science philosophy, stating that the simplest hypothesis (or model) is preferred, at any given level of model predictive performance. A modern restatement often attributed to Einstein explains, “Everything should be made as simple as possible, but not simpler.” Using principles from (algorithmic) information theory, both model descriptive performance and model complexity can be quantified in bits. This quantification yields a Pareto-style trade-off between model complexity (length of the model program in bits) and model performance (information loss in bits, or the missing information, needed to describe the original observations). Model complexity and performance can be collapsed to one single measure of lossless model size, which, when minimized, leads to optimal model complexity versus loss trade-off for generalization and prediction. Our view puts both simple data-driven and complex physical-process-based models on a continuum, in the sense that both describe patterns in observed data in compressed form, with different degrees of generality, model complexity, and descriptive performance. Information theory-based assessment of compression performance with fair and meaningful accounting for model complexity will enable us to best compare and combine the strengths of physics knowledge and data-driven modeling for a given problem, given the availability of data. “Suppose we draw a set of points on paper in a totally random manner” …. “I am saying it is possible to find a geometric line whose notation is constant and uniform, following a certain law, that will pass through all points, and in the same. order they were drawn.” … “But if that law is strongly composed,. the thing that conforms to it should be seen as irregular”Gottfried Wilhelm Leibniz, 1686: Discours de métaphysique V, VI (from French).

KW - Occam's razor

KW - algorithmic information theory

KW - data compression

KW - data-driven modeling

KW - model complexity

KW - physically based modeling

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U2 - 10.1029/2019WR026471

DO - 10.1029/2019WR026471

M3 - Comment/debate

AN - SCOPUS:85080991482

VL - 56

JO - Water Resources Research

JF - Water Resources Research

SN - 0043-1397

IS - 2

M1 - e2019WR026471

ER -