name series is not defined

这个错误通常是因为在代码中使用了未定义的变量或函数。可能的原因是变量或函数名拼写错误，或者变量或函数没有被正确地声明或初始化。要解决这个问题，可以检查代码中是否存在拼写错误，并确保所有变量和函数都已经正确地声明或初始化。

如果是函数未定义的问题，可以将函数定义放在函数调用之前，或者将函数定义放在另一个文件中并使用import语句导入。

如果是变量未定义的问题，可以检查变量名是否正确拼写，并确保变量已经被正确地声明或初始化。

相关问题

name 'ewma' is not defined

The error message "name 'ewma' is not defined" usually occurs when you are trying to use the function "ewma" in your code, but it has not been defined or imported properly.

"ewma" stands for exponentially weighted moving average, which is a mathematical calculation used in time series data analysis.

To solve this error, you need to make sure that you have imported the necessary libraries or modules that contain the "ewma" function. For example, if you are using the Pandas library in Python, you can import the "ewma" function by adding the following line at the beginning of your code:

from pandas import ewma

If you are using a different library or module, you may need to consult its documentation to find out how to import the "ewma" function.

NameError: name 'resample' is not defined

The error message suggests that you are trying to use a variable or function called `resample`, but it has not been defined in your code.

`resample` is a function provided by the `pandas` library that is used for resampling time-series data. To use the `resample` function, you need to first import the `pandas` library using the following code:

import pandas as pd

Then, you can use the `resample` function on a pandas DataFrame object like this:

df_resampled = df.resample('D').sum()

This will resample the data in `df` at a daily frequency and calculate the sum of the values for each day.

Make sure that you have imported the `pandas` library before using any of its functions.