Construct a stsaav class object from a data frame.
the name of the time interval for analysis
character, the name of the time column
character the name of the value column
a stsaav class object which contains
data the original data frame with Year, Month, Week and Day columns added
xycol charcacter vector of tcol and vcol names
ann_sum a vector of annual sums
ann_mean a vector of annual means
ann_dep a vector of annual deparature from the long term annual mean
ann_rdep a vector of annual standardized departures as sd intervals
t_step character, the name of the time step (Month, Week, Day)
t_x vector of years
t_y vector of time steps
t_sum matrix of the sum of the 'value' by t_step and year
t_n matrix of the observation counts
t_mean matrix of the mean observations of 'value'
t_avg vector of the means of means of the value
t_sd matrix of the standard deviation of observations of 'value'
t_dep matrix of the departure from mean for each time step each year
t_rdep matrix of standardized departure from mean for each time step each year
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