Category talk:Variable ©

From Linked Earth Wiki
Jump to: navigation, search

Variable vs Parameter -- Deborah Khider (talk) 13:33, 6 September 2016 (PDT)

The distinction between parameter and variables is thus:

We refer to the relations which supposedly describe a certain physical situation, as a model. Typically, a model consists of one or more equations. The quantities appearing in the equations we classify into variables and parameters. The distinction between these is not always clear cut, and it frequently depends on the context in which the variables appear. Usually a model is designed to explain the relationships that exist among quantities which can be measured independently in an experiment; these are the variables of the model. To formulate these relationships, however, one frequently introduces "constants" which stand for inherent properties of nature (or of the materials and equipment used in a given experiment). These are the parameters.[1]


  1. Bard, Jonathan (1974) Nonlinear Parameter Estimation. New York, Academic Press, p.11, isbn: 0-12-078250-2

Measured vs Inferred Variable -- Deborah Khider (talk) 13:43, 6 September 2016 (PDT)

We chose to distinguish between measured variables (i.e., those that can be directly measured on the archive such as the stable oxygen isotopes of foraminifera shells) and the inferred variables (in this case, temperature and the oxygen isotopic composition of seawater).

In most instances, measured Variables are the proxy observations as defined by Evans et al. [1]. One exception is the variable depth, which served to relate the paleo data with its age counterpart.


  1. Evans, M. N., Tolwinski-Ward, S. E., Thompson, D. M., & Anchukaitis, K. J. (2013). Applications of proxy system modeling in high resolution paleoclimatology. Quaternary Science Reviews, 76, 16-28. doi:10.1016/j.quascirev.2013.05.024