When a time series is analyzed by the model 
and the trend component Tt is set to be the centered moving average 
,which of the following remains to be estimated?
Definitions:
Sexual Response Cycle
A model describing the physiological responses that occur during sexual activity, typically divided into four phases: excitement, plateau, orgasm, and resolution.
Masters and Johnson
Pioneers in sexual function research, known for their work on human sexual response and sexual disorders during the 20th century.
Identified
Recognized or distinguished as being a particular person or thing.
Electroencephalograph
An instrument used to record the electrical activity of the brain, commonly known as an EEG.
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