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2. Software development effort estimation - Wikipedia

   en.wikipedia.org/wiki/Software_development...

   Formal estimation model: The quantification step is based on mechanical processes, e.g., the use of a formula derived from historical data. Combination-based estimation: The quantification step is based on a judgmental and mechanical combination of estimates from different sources. Below are examples of estimation approaches within each category.

3. Empirical characteristic function - Wikipedia

   en.wikipedia.org/wiki/Empirical_characteristic...

   The ECF apparently made its debut in page 342 of the classical textbook of Cramér (1946), [1] and then as part of the auxiliary tools for density estimation in Parzen (1962). [2] Nearly a decade later the ECF features as the main object of research in two separate lines of application: In Press (1972) [ 3 ] for parameter estimation and in ...

4. Sensitivity analysis - Wikipedia

   en.wikipedia.org/wiki/Sensitivity_analysis

   Figure 1. Schematic representation of uncertainty analysis and sensitivity analysis. In mathematical modeling, uncertainty arises from a variety of sources - errors in input data, parameter estimation and approximation procedure, underlying hypothesis, choice of model, alternative model structures and so on.

5. Parameter identification problem - Wikipedia

   en.wikipedia.org/wiki/Parameter_identification...

   The (negative) slope parameter of the demand equation cannot be identified in this case. In other words, the parameters of an equation can be identified if it is known that some variable does not enter into the equation, while it does enter the other equation.

6. Estimation theory - Wikipedia

   en.wikipedia.org/wiki/Estimation_theory

   Estimation theory is a branch of statistics that deals with estimating the values of parameters based on measured empirical data that has a random component. The parameters describe an underlying physical setting in such a way that their value affects the distribution of the measured data.

7. Baum–Welch algorithm - Wikipedia

   en.wikipedia.org/wiki/Baum–Welch_algorithm

   The Baum–Welch algorithm uses the well known EM algorithm to find the maximum likelihood estimate of the parameters of a hidden Markov model given a set of observed feature vectors. Let X t {\displaystyle X_{t}} be a discrete hidden random variable with N {\displaystyle N} possible values (i.e.

8. Statistical parameter - Wikipedia

   en.wikipedia.org/wiki/Statistical_parameter

   In statistical inference, parameters are sometimes taken to be unobservable, and in this case the statistician's task is to estimate or infer what they can about the parameter based on a random sample of observations taken from the full population. Estimators of a set of parameters of a specific distribution are often measured for a population ...

9. Confirmatory factor analysis - Wikipedia

   en.wikipedia.org/wiki/Confirmatory_factor_analysis

   To estimate the parameters of a model, the model must be properly identified. That is, the number of estimated (unknown) parameters (q) must be less than or equal to the number of unique variances and covariances among the measured variables; p(p + 1)/2. This equation is known as the "t rule".