给我一个mann-kendall趋势检验代码,并告诉我如何输入数据
时间: 2023-10-19 09:05:39 浏览: 108
以下是一个mann-kendall趋势检验的Python代码:
```python
from scipy.stats import kendalltau
def mann_kendall(data):
n = len(data)
# Calculate S
s = 0
for i in range(n-1):
for j in range(i+1,n):
s += np.sign(data[j] - data[i])
# Calculate the variance of S
var_S = n*(n-1)*(2*n+5)/18
# Calculate the standard deviation of S
std_S = np.sqrt(var_S)
# Calculate the Mann-Kendall statistic
if s>0:
mk = (s-1)/std_S
elif s<0:
mk = (s+1)/std_S
else:
mk = 0
# Calculate the p-value
pval = 2*(1-norm.cdf(abs(mk))) # two-tailed test
return mk, pval
```
为了输入数据,你需要在代码中调用此函数,并将你要测试的数据作为其参数输入,如:
```python
data = [1, 2, 3, 4, 5, 10, 20, 30, 40, 50]
mk, pval = mann_kendall(data)
print('Mann-Kendall:', mk)
print('p-value:', pval)
```
这将输出Mann-Kendall统计量和对应的p值。你可以在此基础上进行进一步的数据分析或决策。
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