lag data and subset the results
    
     
    shift_subset(x, lag, n_subset, n_shift)
    
    Arguments
    
    
    
      | x | numeric vectorto lag
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      | lag | integer vectorwith the lags
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      | n_subset | integersubset every n_subset values
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      | n_shift | integeramount to shift results
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    Value
    vector with lagged values