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:
Menstruated
The process of menstruation, which is the monthly shedding of the uterine lining in females, typically associated with the reproductive cycle.
Dualistic Thinking
Dividing the cognitive world into opposites, such as good versus bad, or us versus them.
Cognitive World
A term that may refer to the realm of mental processes and structures involved in perception, thinking, understanding, and memory.
Serotonin
A neurotransmitter important in the regulation of mood, anxiety, and happiness, among other functions.
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