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  • Moreover, since every sample has a few unusual observations, there is the danger that a general-specification search will lead to overfitting the data, in the sense of selecting an overly complicated functional form. (encyclopedia.com)
  • form
  • If a = acceleration, t = time, and d = displacement, the laws of physics dictate the functional form d = at 2 /2. (encyclopedia.com)
  • The problem of selecting the proper functional form is particularly difficult in the social sciences because the laws of human behavior are not as precise as the laws of nature. (encyclopedia.com)
  • It is important to use the correct functional form to obtain unbiased and consistent coefficient estimates of the effects of the independent variables on the dependent variable y . (encyclopedia.com)
  • One way to select the functional form is to use a general-to-specific methodology: Estimate a very general nonlinear form and, through hypothesis testing, determine whether it is possible to pare down the model to a more specific form. (encyclopedia.com)
  • Nonrandom errors and/or non-constant coefficients indicate that the functional form of the estimating equation is incorrect. (encyclopedia.com)
  • Another method that can be used to select the most appropriate functional form is out-of-sample forecasting (in which the researcher holds back a portion of the observations from the estimation process and estimates the alternative models over the shortened span of data). (encyclopedia.com)
  • food
  • In the early 1900s food manufacturers in the United States began adding iodine to salt in an effort to prevent goiter, representing one of the first attempts at creating a functional food through fortification. (encyclopedia.com)
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  • In Functional Genomics: Methods and Protocols, leading experimentalists-many pioneers in the field-describe in step-by-step detail robust methods for microarray-based studies and provide expert guidance in optimal data analysis and informatics. (springer.com)