I have a data frequency table and would like to calculate it's mean and standard deviation. The first column symbolises the frequency and second - the value of data.The way I need the mean to be calculated is (446*0+864*1+277*2+...+1*12)/(0+1+2+...+12) = ~1.35
, yet when I use gnuplot stats, it gives me the output of separate columns. How can I change my code so that it would give me the output that I want?
Data table:
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 code:
stats "$input" using 2:1
Output:
* 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
Try this:
Code:
### 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
Result:
* 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
Your values:
2475.0 1835.0
1.34877384196185