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:
Polydactylism
A genetic variation resulting in more than the usual number of fingers or toes on the hands or feet, respectively.
Tay-Sachs Disease
A genetic disorder that destroys nerve cells in the brain and spinal cord progressively due to the absence of a vital enzyme, leading to severe neurological disability and death.
Genetic Drift
Refers to the random fluctuations in the frequency of alleles within a population over time, not due to natural selection.
Sympatric Speciation
Speciation pattern in which speciation occurs within a population, in the absence of a physical barrier to gene flow.
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