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excel-statistical-viz-large-file

Clean Excel data, summarize groups, and examine relationships between numeric columns. Produce charts such as scatter plots with trend lines, calculate measures of fit and statistical significance, and export cleaned data and statistical summaries.

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对 Excel 数据进行多维度统计分析与可视化。

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适用场景

  • Clean missing group labels and numeric text
  • Compare group averages and variation
  • Analyze numeric relationships with scatter plots and trend lines
  • Export charts and cleaned analysis data

包含的文件(1)

  • SKILL.md3.8 KB

SKILL.md(原文)

安装前可以查看交给 AI 代理的指令内容。

excel_statistical_visualization

This sub-skill covers one capability of the Excel workflow. For reading/counting/Parquet optimization, see the parent workflow SKILL.md.

Step1 数据清洗与标准化。提取目标分析列,处理合并单元格(ffill),并利用正则表达式或类型转换清理数值字段,确保分析数据集的准确性。

import re

# 假设 target_col_x 和 target_col_y 是分析目标
# 处理合并单元格导致的缺失值
df['group_col'] = df['group_col'].fillna(method='ffill')

def clean_numeric_string(value):
    if pd.isna(value): return None
    # 保留数字、小数点和负号,移除空格及非法字符
    cleaned = re.sub(r'[^\d\.\-]', '', str(value))
    try:
        return float(cleaned)
    except ValueError:
        return None

df['x_val'] = df['target_col_x'].apply(clean_numeric_string)
df['y_val'] = df['target_col_y'].apply(clean_numeric_string)

# 过滤无效数据
df_clean = df.dropna(subset=['x_val', 'y_val']).copy()

Step2 执行多维度统计分析。计算分类占比、均值、标准差,并构建交叉分析表(crosstab/pivot),为可视化提供数据支撑。

# 分类统计与占比
stats_summary = df_clean.groupby('group_col')['y_val'].agg(['count', 'mean', 'std', 'min', 'max'])
stats_summary['percentage'] = (stats_summary['count'] / stats_summary['count'].sum()) * 100

# 添加总计行
total_row = pd.DataFrame(df_clean[['y_val']].agg(['count', 'mean']).T)
total_row.index = ['Total']

# 交叉分析示例
pivot_table = pd.pivot_table(df_clean, values='y_val', index='group_col', columns='category_col', aggfunc='count', fill_value=0)

Step3 生成高分辨率可视化图表。包含散点图、线性趋势线(R²、p值)、箱线图或柱状图组合,并配置中文字体与美化参数。

import matplotlib.pyplot as plt
import matplotlib
from scipy import stats
import numpy as np

# 字体配置:优先使用 SimHei 或 DejaVu Sans 确保中文显示
matplotlib.rcParams['font.sans-serif'] = ['SimHei', 'WenQuanYi Zen Hei', 'DejaVu Sans']
matplotlib.rcParams['axes.unicode_minus'] = False

x = df_clean['x_val'].values
y = df_clean['y_val'].values

# 线性回归计算
slope, intercept, r_value, p_value, std_err = stats.linregress(x, y)
line = slope * x + intercept

plt.figure(figsize=(12, 8), dpi=300)

# 散点图:添加随机抖动 (jitter) 避免点重叠
jitter_x = x + np.random.normal(0, 0.01, size=len(x))
plt.scatter(jitter_x, y, alpha=0.6, edgecolors='w', label='Data Points')

# 趋势线
plt.plot(x, line, color='red', linestyle='--', linewidth=2, 
         label=f'Trend: y={slope:.4f}x+{intercept:.4f}\n$R^2$={r_value**2:.4f}, p={p_value:.4e}')

# 数据点标注 (实战技巧:仅标注极值或特定点)
for i, (xi, yi) in enumerate(zip(x, y)):
    if i % (len(x)//5 or 1) == 0: # 抽样标注避免拥挤
        plt.annotate(f'({xi:.2f}, {yi:.2f})', (xi, yi), textcoords="offset points", xytext=(5,5), fontsize=8)

plt.xlabel('Dimension X')
plt.ylabel('Dimension Y')
plt.title('Statistical Distribution & Trend Analysis')
plt.grid(True, linestyle=':', alpha=0.6)
plt.legend()

output_img = 'analysis_plot.png'
plt.savefig(output_img, bbox_inches='tight')
plt.show()

Step4 导出分析结果并生成下载链接。将清洗后的数据及统计摘要保存为 CSV 或 Excel 文件。

output_csv = 'cleaned_analysis_data.csv'
# 使用 utf-8-sig 确保 Excel 打开中文不乱码
df_clean.to_csv(output_csv, index=False, encoding='utf-8-sig')

print(f"Visualization saved to: {output_img}")
print(f"Data exported to: {output_csv}")
# 打印回归关键指标供快速参考
print(f"R-squared: {r_value**2:.6f}, P-value: {p_value:.6f}")

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