Here, by default both apt-cache and aptitude search for a package on whole list of packages in repository, but output of aptitude shows whether the package is installed on the system or not by giving a per-package flag which here is 'p' indicating that package is present but not installed and 'i' which indicates that the package is installed, whereas apt-cache just lists the package and its one-line detail without telling if package is installed or not.
deviation deÂ·viÂ·aÂ·tion (dÄ'vÄ-Ä'shÉn) n. A turning away or aside from a normal course. An abnormality. Deviant behavior or attitudes. The difference, especially the absolute difference, between one number in a set and the mean of the set.
MACD stands for Moving Average Convergence Divergence. MACD is an indicator used in technical analysis. This indicator is developed by Gerald Appel who was a trader and market technical analyst. MACD is the difference of a 12 and a 26 exponential moving average. MACD subtracts the 26-period from the 12-period and the result will be displayed in a single line which is the MACD main line. Typical MACD indicators, have one extra line, which is an exponential moving average of the main line. This moving average is set to 9 by default and it is called signal line. In MetaTrader or MT4, the default MACD doesnât have the main MACD line. Instead, it has MACD bars (histogram).