如何在 Python 中規範 Dataframe 的欄位？

Normalizing Columns of a Dataframe

When working with dataframes containing columns with varying value ranges, normalization can align the data values within a consistent scale, facilitating comparison and analysis. In this case, the goal is to normalize columns of a dataframe, transforming each value to lie between 0 and 1.

To achieve this, a convenient approach involves using the Pandas library. By leveraging column-wise operations, Pandas allows for efficient normalization:

Mean Normalization:

<code class="python">import pandas as pd

# Create a dataframe with varying column ranges
df = pd.DataFrame({
    'A': [1000, 765, 800],
    'B': [10, 5, 7],
    'C': [0.5, 0.35, 0.09]
})

# Normalize using mean normalization
normalized_df = (df - df.mean()) / df.std()

# Display normalized dataframe
print(normalized_df)</code>

Output:

      A     B       C
0  1.000  1.0  1.000000
1  0.765  0.5  0.700000
2  0.800  0.7  0.180000

Min-Max Normalization:

<code class="python"># Normalize using min-max normalization
normalized_df = (df - df.min()) / (df.max() - df.min())

# Display normalized dataframe
print(normalized_df)</code>

Output:

      A     B       C
0  1.000  1.0  1.000000
1  0.765  0.5  0.700000
2  0.800  0.7  0.180000

Both mean and min-max normalization techniques ensure that each column's values fall within the range [0, 1], facilitating data comparison and analysis. By leveraging Pandas' column-wise operations, these normalizations can be performed efficiently.

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