Data Mining Glossary

Data Mining Glossary -Visit the site for more.. accuracy Accuracy is an important factor in assessing the success of data mining. When applied to data, accuracy refers to the rate of correct values in the data. When applied to models, accuracy refers to the degree of fit between the model and the data. This measures how error-free the model's predictions are. Since accuracy does not include cost information, it is possible for a less accurate model to be more cost-effective. Also see precision. activation function A function used by a node in a neural net to transform input data from any domain of values into a finite range of values. The original idea was to approximate the way neurons fired, and the activation function took on the value 0 until the input became large and the value jumped to 1. The discontinuity of this 0-or-1 function caused mathematical problems, and sigmoid-shaped functions (e.g., the logistic function) are now used.

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