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我使用statsmodels.formula.api.quantreg在测试集上进行预测。运行此方法时出现意外错误:

AttributeError                            Traceback (most recent call last)
<ipython-input-34-12e0d345b0fc> in <module>
----> 1 test['ypredL'] = model1.predict( test ).values
      2 test['FVC']    = model2.predict( test ).values
      3 test['ypredH'] = model3.predict( test ).values
      4 test['Confidence'] = np.abs(test['ypredH'] - test['ypredL']) / 2

~\anaconda3\envs\knk\lib\site-packages\statsmodels\base\model.py in predict(self, exog, transform, *args, **kwargs)
   1081                        '\n\nThe original error message returned by patsy is:\n'
   1082                        '{0}'.format(str(str(exc))))
-> 1083                 raise exc.__class__(msg)
   1084             if orig_exog_len > len(exog) and not is_dict:
   1085                 import warnings

AttributeError: predict requires that you use a DataFrame when predicting from a model
that was created using the formula api.

The original error message returned by patsy is:
'DataFrame' object has no attribute 'dtype'

有趣的是,在训练集上运行了相同的预测,而且效果非常好!下面是训练部分的代码:

model1 = quantreg('FVC ~ Weeks+Percent+Age+Sex+SmokingStatus',
                           train).fit(q = 0.25)
model2 = quantreg('FVC ~ Weeks+Percent+Age+Sex+SmokingStatus',
                           train).fit(q = 0.5)
model3 = quantreg('FVC ~ Weeks+Percent+Age+Sex+SmokingStatus',
                           train).fit(q = 0.75)

train['y_predL'] = model1.predict(train).values
train['y_pred'] = model2.predict(train).values
train['y_predH'] = model3.predict(train).values

输出: 在此处输入图像描述

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1 回答 1

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错误'DataFrame' object has no attribute 'dtype'是对的,但很难理解。所以,它真正的意思是训练集和测试集之间的 dtypes 必须存在冲突。在问题中,训练集中的周数和测试集中的周数之间存在 dtype 不匹配。

Train-Weeks 的 dtype 是int, Test-Weeks 的 dtype 是str

于 2020-09-07T04:58:30.597 回答