如何按类别绘制平均值的条形图

如何解决如何按类别绘制平均值的条形图

我有一个Pandas DataFrame，其中一列标记为'ocean_proximity'的列包含诸如'near ocean'和'inland'之类的值，另一列标记为'median_house_value'并具有数值

我正在尝试探索这些值之间的关系。

我正在寻找创建一个条形图，其中x轴是唯一的'ocean_proximity'字符串值，条形高度是相关'median_house_values'的平均值。如何在熊猫中做到这一点？

（我所有这些都在jupyter notebook中运行，并且可视化效果正常。）

解决方法

• 使用housing.csv
• 使用seaborn.barplot
  • Seaborn是基于matplotlib的Python数据可视化库。它提供了用于绘制引人入胜且内容丰富的统计图形的高级API。
  • seaborn将自动聚合每个唯一ocean_proximity的数据。
  • 默认情况下，estimator参数为mean。

import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns

# lead the data
df = pd.read_csv('data/so_data/2020-08-11 63365958/housing.csv')

# show the mean for each unique value of ocean_proximity. Only show for confirmation of values.
df.groupby('ocean_proximity',as_index=False)['median_house_value'].mean()

[out]:
  ocean_proximity  median_house_value
0       <1H OCEAN       240084.285464
1          INLAND       124805.392001
2          ISLAND       380440.000000
3        NEAR BAY       259212.311790
4      NEAR OCEAN       249433.977427

# plot
p = sns.barplot('ocean_proximity','median_house_value',data=df,ci=False)

• 请注意，条形高度与分组均值相匹配

• 根据Quang Hoang在评论中的建议

df.groupby('ocean_proximity')['median_house_value'].mean().plot.bar()

• 请注意，条形高度与上一个图相同

housing.csv

200行

longitude,latitude,housing_median_age,total_rooms,total_bedrooms,population,households,median_income,median_house_value,ocean_proximity
-122.23,37.88,41.0,880.0,129.0,322.0,126.0,8.3252,452600.0,NEAR BAY
-122.22,37.86,21.0,7099.0,1106.0,2401.0,1138.0,8.3014,358500.0,NEAR BAY
-122.24,37.85,52.0,1467.0,190.0,496.0,177.0,7.2574,352100.0,NEAR BAY
-122.25,1274.0,235.0,558.0,219.0,5.6431,341300.0,1627.0,280.0,565.0,259.0,3.8462,342200.0,919.0,213.0,413.0,193.0,4.0368,269700.0,37.84,2535.0,489.0,1094.0,514.0,3.6591,299200.0,3104.0,687.0,1157.0,647.0,3.12,241400.0,NEAR BAY
-122.26,42.0,2555.0,665.0,1206.0,595.0,2.0804,226700.0,3549.0,707.0,1551.0,714.0,3.6912,261100.0,2202.0,434.0,910.0,402.0,3.2031,281500.0,3503.0,752.0,1504.0,734.0,3.2705,241800.0,2491.0,474.0,1098.0,468.0,3.075,213500.0,696.0,191.0,345.0,174.0,2.6736,191300.0,2643.0,626.0,1212.0,620.0,1.9167,159200.0,50.0,1120.0,283.0,697.0,264.0,2.125,140000.0,NEAR BAY
-122.27,1966.0,347.0,793.0,331.0,2.775,152500.0,1228.0,293.0,648.0,303.0,2.1202,155500.0,2239.0,455.0,990.0,419.0,1.9911,158700.0,1503.0,298.0,690.0,275.0,2.6033,162900.0,40.0,751.0,184.0,409.0,166.0,1.3578,147500.0,1639.0,367.0,929.0,366.0,1.7135,159800.0,2436.0,541.0,1015.0,478.0,1.725,113900.0,1688.0,337.0,853.0,325.0,2.1806,99700.0,2224.0,437.0,1006.0,422.0,2.6,132600.0,NEAR BAY
-122.28,535.0,123.0,317.0,119.0,2.4038,107500.0,49.0,1130.0,244.0,607.0,239.0,2.4597,93800.0,1898.0,421.0,1102.0,397.0,1.808,105500.0,2082.0,492.0,1131.0,473.0,1.6424,108900.0,729.0,160.0,395.0,155.0,1.6875,132000.0,1916.0,447.0,863.0,378.0,1.9274,122300.0,2153.0,481.0,1168.0,441.0,1.9615,115200.0,48.0,1922.0,1026.0,335.0,1.7969,110400.0,37.83,1655.0,754.0,329.0,1.375,104900.0,51.0,2665.0,574.0,1258.0,536.0,2.7303,109700.0,1215.0,282.0,570.0,1.4861,97200.0,1798.0,432.0,987.0,374.0,1.0972,104500.0,1511.0,390.0,901.0,403.0,1.4103,103900.0,1470.0,330.0,689.0,309.0,3.48,191400.0,2432.0,715.0,1377.0,2.5898,176000.0,1665.0,946.0,2.0978,155400.0,936.0,311.0,517.0,249.0,1.2852,150000.0,713.0,202.0,462.0,189.0,1.025,118800.0,950.0,467.0,198.0,3.9643,188800.0,1443.0,660.0,292.0,3.0125,184400.0,1656.0,420.0,718.0,382.0,2.6768,182300.0,1125.0,616.0,304.0,2.026,142500.0,37.82,43.0,1007.0,312.0,253.0,1.7348,137500.0,624.0,195.0,423.0,0.9506,187500.0,375.0,700.0,352.0,1.775,112500.0,896.0,453.0,735.0,438.0,0.9218,171900.0,1868.0,456.0,1061.0,407.0,1.5045,3221.0,1959.0,720.0,1.1108,97500.0,1630.0,1162.0,400.0,1.2475,104200.0,1170.0,701.0,233.0,1.6098,87500.0,945.0,243.0,576.0,220.0,1.4113,83100.0,1238.0,288.0,622.0,1.5057,1489.0,728.0,0.8172,85300.0,1387.0,341.0,1074.0,1.2171,80300.0,NEAR BAY
-122.29,2.0,158.0,94.0,57.0,2.5625,60000.0,1121.0,211.0,554.0,187.0,3.3929,75700.0,135.0,29.0,86.0,23.0,6.1183,75000.0,37.81,760.0,377.0,122.0,0.9011,86100.0,NEAR BAY
-122.3,1224.0,237.0,521.0,159.0,1.1909999999999998,76100.0,828.0,182.0,392.0,133.0,2.5938,73500.0,1010.0,209.0,604.0,1.1667,78400.0,1455.0,354.0,788.0,332.0,0.8056,84400.0,37.8,1027.0,147.0,2.6094,81300.0,572.0,109.0,274.0,82.0,1.8516,85000.0,46.0,2801.0,644.0,1823.0,611.0,0.9802,129200.0,26.0,768.0,152.0,127.0,1.7719,82500.0,935.0,297.0,582.0,277.0,0.7286,95200.0,844.0,204.0,560.0,1.75,12.0,4.0,18.0,7.0,0.4999,67500.0,20.0,835.0,161.0,290.0,2.483,17.0,1237.0,762.0,439.0,0.9241,177500.0,36.0,2914.0,562.0,1236.0,509.0,2.4464,102100.0,19.0,1207.0,721.0,207.0,1.1111,108300.0,1745.0,1054.0,0.8026,38.0,684.0,176.0,344.0,2.0114,131300.0,924.0,289.0,609.0,1.5,162500.0,210.0,56.0,183.0,340.0,97.0,200.0,87.0,1.5208,386.0,164.0,346.0,0.8075,35.0,948.0,169.0,1.8088,773.0,143.0,115.0,2.4083,98200.0,451.0,380.0,0.977,10.0,875.0,348.0,546.0,0.76,105.0,125.0,39.0,0.9722,78.0,396.0,85.0,1.2434,500001.0,16.0,994.0,800.0,362.0,2.0938,215.0,904.0,88.0,0.8668,96.0,31.0,34.0,0.75,37.79,27.0,1055.0,302.0,2.6354,1715.0,623.0,1327.0,1.8477,179200.0,5329.0,2477.0,3469.0,2323.0,2.0096,130000.0,4596.0,1331.0,2048.0,1180.0,2.8345,183800.0,107.0,91.0,2.0062,125000.0,22.0,3682.0,1270.0,2024.0,1250.0,1.2185,170000.0,37.0,3633.0,1085.0,1838.0,980.0,2.6104,193100.0,4656.0,1414.0,2304.0,2.4912,257800.0,28.0,5806.0,1603.0,2563.0,1497.0,3.2177,273400.0,854.0,242.0,389.0,228.0,3.125,237500.0,2155.0,895.0,613.0,2.5795,350000.0,5871.0,1914.0,2689.0,1789.0,2.8406,335700.0,1509.0,225.0,674.0,4.9306,313400.0,2026.0,482.0,709.0,3.2727,268500.0,1758.0,460.0,686.0,3.1691,259400.0,3481.0,1444.0,3.9,275700.0,3337.0,855.0,1520.0,802.0,3.9063,225000.0,1424.0,550.0,5.0917,262500.0,32.0,3809.0,1806.0,1022.0,2.6429,218500.0,3959.0,1196.0,1749.0,1217.0,3.0233,255000.0,2376.0,559.0,939.0,519.0,3.1484,224100.0,1613.0,428.0,675.0,3.4722,243100.0,1279.0,287.0,534.0,291.0,3.1429,231600.0,5022.0,1750.0,2558.0,1661.0,2.4234,4190.0,1105.0,1786.0,1037.0,3.0897,234100.0,NEAR BAY
-122.23,2515.0,399.0,970.0,373.0,5.8596,327600.0,47.0,3175.0,454.0,485.0,5.2868,347600.0,2576.0,406.0,794.0,376.0,5.956,366100.0,334.0,54.0,98.0,4.9643,335000.0,2800.0,411.0,6.3434,373600.0,3529.0,1177.0,555.0,5.1773,389500.0,2612.0,365.0,7.2354,391100.0,5287.0,1048.0,2031.0,956.0,5.457000000000001,337300.0,2935.0,1031.0,479.0,7.5,295200.0,NEAR BAY
-122.21,44.0,3424.0,597.0,1358.0,6.0194,292300.0,4991.0,1616.0,654.0,7.5544,411500.0,NEAR BAY
-122.2,30.0,2211.0,343.0,6.0666,311500.0,3038.0,490.0,1140.0,7.0548,325900.0,NEAR BAY
-122.19,1617.0,533.0,194.0,11.6017,392600.0,2865.0,1072.0,443.0,7.4882,319300.0,5065.0,766.0,6.8976,333300.0,1326.0,463.0,8.2049,335200.0,1589.0,223.0,542.0,8.401,351200.0,1791.0,271.0,661.0,269.0,6.8538,368900.0,1835.0,635.0,263.0,8.317,365900.0,1229.0,181.0,7.0175,366700.0,3770.0,1265.0,500.0,6.3302,362800.0,NEAR BAY
-122.18,6.3624,483300.0,2375.0,333.0,813.0,350.0,7.0549,331400.0,45.0,2964.0,436.0,1067.0,426.0,6.7851,323500.0,2833.0,605.0,1260.0,552.0,2.8929,216700.0,2254.0,951.0,487.0,3.0812,233100.0,1389.0,212.0,510.0,224.0,5.2402,296400.0,1971.0,765.0,308.0,6.5217,273700.0,2183.0,465.0,1129.0,3.2632,227700.0,2286.0,464.0,1073.0,3.0298,199600.0,2721.0,1185.0,515.0,4.5428,239800.0,339.0,756.0,4.072,270100.0,2944.0,1034.0,5.3509,302100.0,2033.0,486.0,787.0,459.0,3.1603,269500.0,1433.0,229.0,612.0,4.7708,314700.0,2927.0,1021.0,8.1564,390100.0,2315.0,861.0,258.0,8.8793,410300.0,2485.0,313.0,953.0,327.0,6.8591,352400.0,1490.0,238.0,634.0,256.0,6.0302,287300.0,2814.0,878.0,7.507999999999999,348700.0,2093.0,918.0,483.0,2.7477,243800.0,888.0,168.0,360.0,175.0,2.1944,211500.0,2087.0,1197.0,488.0,3.0149,218400.0,2513.0,502.0,518.0,3.675,269900.0,3232.0,1373.0,747.0,3.225,218800.0,4120.0,1065.0,2.9345,2364.0,792.0,1359.0,722.0,2.1429,250000.0,1471.0,469.0,1062.0,1.6121,171400.0,2468.0,864.0,1335.0,1.3929,193800.0,1632.0,1171.0,429.0,2.3173,526.0,1475.0,1.7772,629.0,188.0,742.0,196.0,2.6458,1339.0,391.0,1086.0,363.0,2.181,138800.0,1678.0,606.0,1645.0,543.0,2.2303,116700.0,2344.0,1710.0,1.6504,151800.0,996.0,731.0,2.2697,127000.0,1591.0,1118.0,2.1563,128600.0,1586.0,398.0,2.1348,140600.0,2046.0,588.0,1213.0,2.6292,182700.0,1192.0,772.0,257.0,2.3833,146900.0,1803.0,1321.0,401.0,2.957,122800.0,2838.0,749.0,1487.0,677.0,2.5238,169300.0,783.0,186.0,1.9375,126600.0,1590.0,414.0,949.0,1.9028,127900.0,1746.0,480.0,1149.0,415.0,2.25,123500.0,1252.0,299.0,2.3929,111900.0,5963.0,1344.0,4367.0,1231.0,2.1917,112800.0,1783.0,1659.0,412.0,2.9357,107900.0,999.0,1011.0,1.8854,1469.0,431.0,1464.0,2.1638,1372.0,95500.0,180.0,3.375,116100.0,1626.0,1284.0,357.0,2.2542,112200.0,55.0,2.1,461.0,381.0,1.6,902.0,846.0,227.0,3.625,2373.0,779.0,676.0,1.6929,115000.0,37.77,128.0,520.0,138.0,1.6471,95000.0,1137.0,301.0,866.0,2.59,96400.0,769.0,206.0,2.57,72000.0,37.78,472.0,146.0,71300.0,NEAR BAY