Fitting an Equation to Data Impartially

Fitting ACE structural equation models to case-control family data.

Investigators interested in whether a disease aggregates in families often collect case-control family data, which consist of disease status and covariate information for members of families selected via case or control probands. Here, we focus on the use of case-control family data to investigate the relative contributions to the disease of additive genetic effects (A), shared family environme...

An Algorithm for Fitting an Archimedean Spiral to Empirical Data

1. Introduction : Let there be a set of (empirically obtained) points Z= (z 1 , z 2 ,…,z n) : n ≥ 3 and any z i = (x i , y i). Let an inspection of the pattern that these points suggest or a conjecture regarding the law governing the generation of these points indicate that they resemble the trace (Buck, pp. 313-318) of a spiral. Then there may arise a need to investigate the law generating suc...

Superellipse fitting to partial data

Superellipses can be used to represent in a compact form a large variety of shapes, and are useful for modelling in the fields of computer graphics and computer vision. However, fitting them to data is difficult and computationally expensive. Moreover, when only partial data is available the parameter estimates become unreliable. This paper attempts to improve the process of fitting to partial ...

Fitting Models to Grouped Data

Fitting the von Bertalanffy growth equation to polar bear age–weight data

KINGSLEY, M. C. S. 1979. Fitting the von Bertalanffy growth equation to polar bear age-weight data. Can. J. Zool. 57: 1020-1025. Heavy sea ice in the Canadian Arctic in the winter of 19731974 reduced seal populations; polar bears, preying principally on seals, consequently lost weight. The nature and degree of this weight loss was investigated by examining the parameters of von Bertalanffy grow...