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Python 房价空间分析完结篇:区域对比、时间序列与结论

  • 2026-06-28 04:40:51
Python 房价空间分析完结篇:区域对比、时间序列与结论

本系列第三篇(完结)。Part 1[1] 讲全局 Moran’s I,Part 2[2] 讲 LISA 局部聚类。本篇做区域对比、时间序列分析和最终结论。

1. Step 1:给城市分区域

国家统计局 70 城没有自带区域标签,需要手动分组:

REGIONS = {
"京津冀": ["北京""天津""石家庄""唐山""秦皇岛"],
"长三角": ["上海""南京""无锡""杭州""宁波""合肥""温州""金华""徐州""扬州""蚌埠""安庆"],
"珠三角": ["广州""深圳""惠州""韶关""湛江"],
"海西+海南": ["福州""厦门""泉州""海口""三亚"],
"中部": ["武汉""长沙""郑州""南昌""太原""洛阳""平顶山""宜昌""襄阳""岳阳""常德""九江""赣州""济宁""烟台""济南""青岛"],
"西部": ["重庆""成都""西安""贵阳""昆明""兰州""西宁""银川""乌鲁木齐""南宁""桂林""北海""泸州""南充""遵义""大理""呼和浩特""包头"],
"东北": ["沈阳""大连""长春""哈尔滨""丹东""锦州""吉林""牡丹江"],
}

defassign_region(city):
for region, cities in REGIONS.items():
if city in cities:
return region
return"其他"

gdf['region'] = gdf['CITY'].map(assign_region)

分组有争议吗? 有。蚌埠、安庆同时被长三角和中部"认领"(代码按顺序匹配,先命中长三角)。山东的济南、青岛被归入"中部"而非"东部"。这些是简化处理,实际分析中应该用国家统计局的标准区划,或根据研究目的自定义。

2. Step 2:区域对比——涨幅和波动率并排

import matplotlib.pyplot as plt

fig, axes = plt.subplots(12, figsize=(187))

# 左图:区域平均累计涨幅
reg_cum = gdf.groupby('region')['cum_return'].agg(['mean''std']).sort_values('mean', ascending=True)
colors_cum = ['
#4e79a7'if r != '海西+海南'else'#e15759'for r in reg_cum.index]

axes[0].barh(reg_cum.index, reg_cum['mean'], xerr=reg_cum['std'],
             color=colors_cum, alpha=0.85, edgecolor='white', capsize=4)
for i, (name, row) inenumerate(reg_cum.iterrows()):
    axes[0].text(row['mean'] + 1, i, f\"{row['mean']:.1f}%\", va='center', fontsize=9, fontweight='bold')
axes[0].set_xlabel('平均累计涨幅(%)')
axes[0].set_title('区域平均累计涨幅', fontweight='bold')
axes[0].grid(True, axis='x', alpha=0.2)

# 右图:区域平均波动率
reg_vol = gdf.groupby('region')['volatility'].agg(['mean', 'std']).sort_values('mean', ascending=True)
reg_vol['mean_pct'] = reg_vol['mean'] * 100
reg_vol['std_pct'] = reg_vol['std'] * 100

axes[1].barh(reg_vol.index, reg_vol['mean_pct'], xerr=reg_vol['std_pct'],
             color=colors_cum, alpha=0.85, edgecolor='white', capsize=4)
for i, (name, row) in enumerate(reg_vol.iterrows()):
    axes[1].text(row['mean_pct'] + 0.5, i, f\"{row['mean_pct']:.1f}%\", va='center', fontsize=9, fontweight='bold')
axes[1].set_xlabel('平均波动率(%)')
axes[1].set_title('区域平均波动率', fontweight='bold')
axes[1].grid(True, axis='x', alpha=0.2)

plt.suptitle('区域对比:涨幅 vs 波动率', fontsize=15, fontweight='bold', y=1.02)
plt.tight_layout()
plt.savefig('regional_comparison.png', dpi=150, bbox_inches='tight')
区域对比:涨幅 vs 波动率

两个排名几乎完全一致

排名
区域
平均涨幅
平均波动率
1
海西+海南
128.6%
128.6%
2
珠三角
96.8%
96.9%
3
长三角
93.9%
84.1%
4
京津冀
105.9%
77.0%
5
西部
83.6%
75.5%
6
中部
78.8%
71.8%
7
东北
68.7%
71.7%

海西+海南在涨幅和波动率上都排第一,东北都排最后。但注意一个例外:京津冀涨幅排第 2(105.9%),波动率只排第 4(77.0%)——说明京津冀涨得多但涨得稳,政策管控压制了波动。

3. Step 3:10 城 20 年累计走势

cities = ['北京''上海''深圳''广州''成都''武汉''温州''三亚''大连''贵阳']

fig, ax = plt.subplots(figsize=(148))
for city in cities:
    c = df_mom[df_mom['CITY'] == city].sort_values('DATE')
    cum_idx = (c['index_value'] / 100).cumprod() * 100
    ax.plot(range(len(cum_idx)), cum_idx, label=city, linewidth=1.5, alpha=0.8)

ax.axhline(100, color='gray', linestyle='--', linewidth=0.8, alpha=0.5)

# 标注关键政策节点
events = {24'2008 金融危机'96'2014 限购放松'120'2016 去库存'180'2021 调控收紧'}
for month, label in events.items():
    ax.axvline(month, color='red', linestyle=':', linewidth=0.8, alpha=0.4)
    ax.text(month + 1, ax.get_ylim()[1] * 0.95, label, fontsize=8, color='red', alpha=0.7)

ax.set_xlabel('月份(2006.01 起)')
ax.set_ylabel('累计指数(基期=100)')
ax.set_title('10 城房价指数累计走势(2006-2026)', fontweight='bold')
ax.legend(loc='upper left', fontsize=9)
ax.grid(True, alpha=0.2)
plt.savefig('time_series.png', dpi=150, bbox_inches='tight')
10 城房价累计走势

看图要点

  1. 2008 年前
    :所有城市还挤在一起,差距不大
  2. 2014-2016 年
    :分水岭。北京、上海、深圳加速上行,三亚暴涨后暴跌,温州、大连开始掉队
  3. 2021 年后
    :全线回调,但一线城市跌幅小,三四线跌幅大
  4. 三亚的过山车
    :2010 年国际旅游岛政策 → 暴涨 → 2011-2012 调控暴跌 → 2015-2016 再涨 → 2021 再跌。这就是波动率 204% 的来源

4. Step 4:汇总——最终结论

三篇教程下来,核心发现可以用一张表总结:

分析方法
变量
结果
含义
全局 Moran’s I
累计涨幅
I = -0.007, p = 0.44
涨跌幅没有空间聚集
全局 Moran’s I
波动率
I = 0.30, p = 0.001
波动率有显著空间聚集
LISA 局部聚类
波动率
8 城显著,HH=三亚/海口/北海/湛江
海南+北部湾是唯一波动率热点
区域对比
两者
排名几乎一致
高涨幅区域也是高波动区域
时间序列
累计走势
2014 年后急剧分化
城市分化在特定年份突然拉开

一句话结论:买房不用看邻居涨了多少(涨跌幅没有空间规律),但如果你的城市波动率高,周边城市大概率也高(波动率有空间规律,尤其是海南北部湾)。

5. 局限性

  1. 70 城全是大中城市,缺少三四线"卫星城"。如果纳入全部 292 个地级市,价格本身的空间聚集可能会出现——小城市对邻近大城市的依赖度更高(Wang & Yang, 2025, Humanities and Social Sciences Communications)。

  2. KNN k=5 是经验值。不同 k 值下核心结论不变,但具体哪些城市进入聚类会变。k=3 时北海退出 HH 簇,k=7 时广州深圳加入。

  3. 区域分组有简化。蚌埠/安庆同时属于长三角和中部,山东城市被归入"中部"而非"东部"。更严谨的做法是用国家统计局的标准区划。

参考链接

[1] https://www.renhai.online/blog/geospatial-data-analysis/python-spatial-autocorrelation-housing-70cities

[2] https://www.renhai.online/blog/geospatial-data-analysis/python-lisa-local-autocorrelation-housing

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  1. CONNECT:[ UseTime:0.001211s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001798s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000736s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000667s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001466s ]
  6. SELECT * FROM `set` [ RunTime:0.000593s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001837s ]
  8. SELECT * FROM `article` WHERE `id` = 500340 LIMIT 1 [ RunTime:0.001170s ]
  9. UPDATE `article` SET `lasttime` = 1783016348 WHERE `id` = 500340 [ RunTime:0.019137s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.005721s ]
  11. SELECT * FROM `article` WHERE `id` < 500340 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001360s ]
  12. SELECT * FROM `article` WHERE `id` > 500340 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005491s ]
  13. SELECT * FROM `article` WHERE `id` < 500340 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.035468s ]
  14. SELECT * FROM `article` WHERE `id` < 500340 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004832s ]
  15. SELECT * FROM `article` WHERE `id` < 500340 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.020883s ]
0.273906s