The percentage of variation explained, 
, is the square of the correlation between the observed Y values and the fitted Y values.
Definitions:
Federal Test Parameter
Regulations or specifications established by federal agencies for testing products or materials to ensure they meet safety or quality standards.
FTP
File Transfer Protocol, a standard network protocol used for the transfer of computer files between a client and server on a computer network.
Malfunction Indicator Light
A warning light on a vehicle's dashboard designed to alert the driver of a malfunction in the engine or emission control system.
Emissions
The output of gases or particles released into the environment from an engine or other machinery, often subject to regulations to limit pollution.
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