问题描述
我正在尝试仅使用自动回归算法来构建老式模型.我发现在 statsmodel 包中有它的实现.我已经阅读了文档，据我所知，它应该可以作为 ARIMA 使用.所以，这是我的代码:
I'm trying to build old school model using only auto regression algorithm. I found out that there's an implementation of it in statsmodel package. I've read the documentation, and as I understand it should work as ARIMA. So, here's my code:
import statsmodels.api as sm
model = sm.tsa.AutoReg(df_train.beer, 12).fit()
当我想预测新值时，我会尝试遵循文档:
And when I want to predict new values, I'm trying to follow the documentation:
y_pred = model.predict(start=df_test.index.min(), end=df_test.index.max())
# or
y_pred = model.predict(start=100, end=1000)
两者都返回一个 NaN 列表.
Both returns a list of NaNs.
此外，当我输入 model.predict(0, df_train.size - 1) 时，它会预测实际值，但是 model.predict(0, df_train.size)预测 NaN 列表.
Also, when I type model.predict(0, df_train.size - 1) it predicts real values, but model.predict(0, df_train.size) predicts NaNs list.
我做错了吗?
P.S. 我知道有 ARIMA、ARMA 或 SARIMAX 算法，可以用作基本的自动回归.但我需要完全自动注册.
P.S. I know there's ARIMA, ARMA or SARIMAX algorithms, that can be used as basic auto regression. But I need exactly AutoReg.
推荐答案
您可以使用此代码进行预测
You can use this code for forecasting
model = sm.tsa.AutoReg(df_train.beer, 12).fit()
y_pred = model.model.predict(model.params, start=df_test.index.min(), end=df_test.index.max())
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