ClickHouse/docs/ja/sql-reference/aggregate-functions/reference/exponentialtimedecayedavg.md
2024-11-18 11:58:58 +09:00

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/ja/sql-reference/aggregate-functions/reference/exponentialTimeDecayedAvg 133 exponentialTimeDecayedAvg

exponentialTimeDecayedAvg

時点 t での時系列データの指数平滑加重移動平均を返します。

構文

exponentialTimeDecayedAvg(x)(v, t)

引数

パラメータ

戻り値

  • 時点 t における指数平滑加重移動平均を返します。 Float64

クエリ:

SELECT
    value,
    time,
    round(exp_smooth, 3),
    bar(exp_smooth, 0, 5, 50) AS bar
FROM
    (
    SELECT
    (number = 0) OR (number >= 25) AS value,
    number AS time,
    exponentialTimeDecayedAvg(10)(value, time) OVER (ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS exp_smooth
    FROM numbers(50)
    );

応答:

   ┌─value─┬─time─┬─round(exp_smooth, 3)─┬─bar────────┐
1.      1     0                     1  ██████████ 
2.      0     1                 0.475  ████▊      
3.      0     2                 0.301  ███        
4.      0     3                 0.214  ██▏        
5.      0     4                 0.162  █▌         
6.      0     5                 0.128  █▎         
7.      0     6                 0.104            
8.      0     7                 0.086            
9.      0     8                 0.072            
0.      0     9                 0.061            
1.      0    10                 0.052            
2.      0    11                 0.045            
3.      0    12                 0.039            
4.      0    13                 0.034            
5.      0    14                  0.03            
6.      0    15                 0.027            
7.      0    16                 0.024            
8.      0    17                 0.021            
9.      0    18                 0.018            
0.      0    19                 0.016            
1.      0    20                 0.015            
2.      0    21                 0.013            
3.      0    22                 0.012             
4.      0    23                  0.01             
5.      0    24                 0.009             
6.      1    25                 0.111            
7.      1    26                 0.202  ██         
8.      1    27                 0.283  ██▊        
9.      1    28                 0.355  ███▌       
0.      1    29                  0.42  ████▏      
1.      1    30                 0.477  ████▊      
2.      1    31                 0.529  █████▎     
3.      1    32                 0.576  █████▊     
4.      1    33                 0.618  ██████▏    
5.      1    34                 0.655  ██████▌    
6.      1    35                 0.689  ██████▉    
7.      1    36                 0.719  ███████▏   
8.      1    37                 0.747  ███████▍   
9.      1    38                 0.771  ███████▋   
0.      1    39                 0.793  ███████▉   
1.      1    40                 0.813  ████████▏  
2.      1    41                 0.831  ████████▎  
3.      1    42                 0.848  ████████▍  
4.      1    43                 0.862  ████████▌  
5.      1    44                 0.876  ████████▊  
6.      1    45                 0.888  ████████▉  
7.      1    46                 0.898  ████████▉  
8.      1    47                 0.908  █████████  
9.      1    48                 0.917  █████████▏ 
0.      1    49                 0.925  █████████▏ 
   └───────┴──────┴──────────────────────┴────────────┘