Python Statsmodels arima模型返回错误
我已经开始学习statsmodels软件包,无法使用arima实现基本预测 错误是 ValueError:给定一个对象,索引不包含日期 我尝试将此作为一个版本:Python Statsmodels arima模型返回错误,python,pandas,statsmodels,Python,Pandas,Statsmodels,我已经开始学习statsmodels软件包,无法使用arima实现基本预测 错误是 ValueError:给定一个对象,索引不包含日期 我尝试将此作为一个版本: df = make_df(filename_data) y = [] x = [] # here I am preparing day by day sequence as that I have inconsistent data and I set 0 to NAN values start_date = df[date_co
df = make_df(filename_data)
y = []
x = []
# here I am preparing day by day sequence as that I have inconsistent data and I set 0 to NAN values
start_date = df[date_col].min()
end_date = df[date_col].max()
while start_date <= end_date:
x.append(start_date)
try:
y.append(
df[df[date_col] == start_date][rev_col].values[0])
except:
y.append(0)
start_date += datetime.timedelta(days=1)
y = np.array(y)
x = np.array(x)
y = pd.TimeSeries(y, index=x)
print(y)
arma_mod = sm.tsa.ARMA(y, order=(2,2))
arma_res = arma_mod.fit(trend='nc', disp=-1)
为什么会这样
日期-收入数据看起来正常:
2014-08-04 59477
2014-08-05 29989
2014-08-06 29989
2014-08-07 116116
您只需使用as_matrix()转换数据帧即可 示例工作代码:
from statsmodels.tsa.arima_model import ARIMA
import numpy as np
def plot_residuals(data, ord=(2, 0, 1)):
model = ARIMA(endog=data, order=(ord[0], 0, ord[1])).fit()
plt.plot(model.resid)
plt.show()
data = np.log(data.values) - np.log(data.values.shift()).to_frame().dropna().as_matrix()
plot_residuals(data, (2, 0, 1))
由于statsmodels有许多未解决的问题,它只能暂时帮助您
from statsmodels.tsa.arima_model import ARIMA
import numpy as np
def plot_residuals(data, ord=(2, 0, 1)):
model = ARIMA(endog=data, order=(ord[0], 0, ord[1])).fit()
plt.plot(model.resid)
plt.show()
data = np.log(data.values) - np.log(data.values.shift()).to_frame().dropna().as_matrix()
plot_residuals(data, (2, 0, 1))