gnuplot频率表统计信息

Question

我有一个数据频率表，想计算它的平均值和标准偏差。第一列代表频率，第二列代表数据值。我需要计算平均值的方式是446*0+864*1+277*2+...+1*12 = ~ 1.35，但是当我使用gnuplot统计信息时，它分别为我提供了输出。如何更改我的代码，以便为我提供所需的输出？

数据表：

446 0
864 1
277 2
111 3
62  4
32  5
19  6
9   7
8   8
3   10
3   11
1   12

Gnuplot代码：

stats "$input" using 2:1

输出：

* FILE: 
  Records:           12
  Out of range:       0
  Invalid:            0
  Column headers:     0
  Blank:              0
  Data Blocks:        1

* COLUMNS:
  Mean:               5.7500           152.9167
  Std Dev:            3.7887           251.5374
  Sample StdDev:      3.9572           262.7223
  Skewness:           0.1569             1.9131
  Kurtosis:           1.8227             5.5436
  Avg Dev:            3.2500           188.0417
  Sum:               69.0000          1835.0000
  Sum Sq.:          569.0000        1.03986e+06

  Mean Err.:          1.0937            72.6126
  Std Dev Err.:       0.7734            51.3449
  Skewness Err.:      0.7071             0.7071
  Kurtosis Err.:      1.4142             1.4142

  Minimum:            0.0000 [ 0]        1.0000 [11]
  Maximum:           12.0000 [11]      864.0000 [ 1]
  Quartile:           2.5000             5.5000
  Median:             5.5000            25.5000
  Quartile:           9.0000           194.0000

  Linear Model:       y = -46.89 x + 422.5
  Slope:              -46.89 +- 14.86
  Intercept:          422.5 +- 102.4
  Correlation:        r = -0.7062
  Sum xy:             2475

Answer 1

尝试一下：

代码：

### special mean
reset session

$Data <<EOD
446 0
864 1
277 2
111 3
62  4
32  5
19  6
9   7
8   8
3   10
3   11
1   12
EOD

stats $Data u ($1*$2):1

print STATS_sum_x, STATS_sum_y
print STATS_sum_x/STATS_sum_y
### end of code

结果：

* FILE: 
  Records:           12
  Out of range:       0
  Invalid:            0
  Column headers:     0
  Blank:              0
  Data Blocks:        1

* COLUMNS:
  Mean:             206.2500           152.9167
  Std Dev:          252.3441           251.5374
  Sample StdDev:    263.5648           262.7223
  Skewness:           1.5312             1.9131
  Kurtosis:           4.2761             5.5436
  Avg Dev:          195.6667           188.0417
  Sum:             2475.0000          1835.0000
  Sum Sq.:       1.27460e+06        1.03986e+06

  Mean Err.:         72.8455            72.6126
  Std Dev Err.:      51.5095            51.3449
  Skewness Err.:      0.7071             0.7071
  Kurtosis Err.:      1.4142             1.4142

  Minimum:            0.0000 [ 0]        1.0000 [11]
  Maximum:          864.0000 [ 1]      864.0000 [ 1]
  Quartile:          31.5000             5.5000
  Median:            89.0000            25.5000
  Quartile:         290.5000           194.0000

  Linear Model:       y = 0.7622 x - 4.279
  Slope:              0.7622 +- 0.2032
  Intercept:          -4.279 +- 66.21
  Correlation:        r = 0.7646
  Sum xy:             9.609e+05

您的值：

2475.0 1835.0
1.34877384196185