我无法在学区中加入FBI犯罪数据。
在同一州有一些名称相同的城市/城镇，因此可以使用县（县）来分隔这些值。在2003年至2017年期间，大约还有1700个县。但是，当我尝试将此数据集与另一个学区数据集连接时，有限值连接（如果我是内部连接，则我将从1700中得到200）。在这个论坛上，还有另一个问题（Issues with Character Values），其他成员帮助我解决了空白问题，但是奇怪的是，这对数据集的加入没有帮助。以下是宾夕法尼亚州亚当斯县的犯罪数据和犯罪地区。
一个简单的left_join应该可以工作，但是您会看到我没有任何区值。 Inner_join产生零行，因此数据中存在一些无法识别的问题。 STATE，COUNTY和CITY均为字符，年份为数字。这些是将两列连接在一起的变量。
我尝试修剪所有分类变量周围的空格。没有骰子。
根据经验，我加入的是district_ids，place_ids等，但是FBI犯罪数据比较笨拙，并且没有任何数据，因此是绝对的。
犯罪数据
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地区数据
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2008, 2009, 2009, 2009, 2009, 2009, 2009, 2009, 2009, 2009, 2009,
2009, 2009, 2009, 2009, 2010, 2010, 2010, 2010, 2010, 2010, 2010,
2010, 2010, 2010, 2010, 2010, 2010, 2010, 2011, 2011, 2011, 2011,
2011, 2011, 2011, 2011, 2011, 2011, 2011, 2011, 2011, 2011, 2012,
2012, 2012, 2012, 2012, 2012, 2012, 2012, 2012, 2012, 2012, 2012,
2012, 2012, 2013, 2013, 2013, 2013, 2013, 2013, 2013, 2013, 2013,
2013, 2013, 2013, 2013, 2013, 2014, 2014, 2014, 2014, 2014, 2014,
2014, 2014, 2014, 2014, 2014, 2014, 2014, 2014, 2015, 2015, 2015,
2015, 2015, 2015, 2015, 2015, 2015, 2015, 2015, 2015, 2015, 2015,
2016, 2016, 2016, 2016, 2016, 2016, 2016, 2016, 2016, 2016, 2016,
2016, 2016, 2016, 2017, 2017, 2017, 2017, 2017, 2017, 2017, 2017,
2017, 2017, 2017, 2017, 2017, 2017, 2003, 2003, 2003, 2003, 2003,
2003, 2003, 2003, 2003, 2003, 2003, 2003, 2003, 2003, 2003, 2003,
2004, 2004, 2004, 2004, 2004, 2004, 2004, 2004, 2004, 2004, 2004,
2004, 2004, 2004, 2004, 2004, 2005, 2005, 2005, 2005, 2005, 2005,
2005, 2005, 2005, 2005, 2005, 2005, 2005, 2005, 2005, 2005, 2006,
2006, 2006, 2006, 2006, 2006, 2006, 2006, 2006, 2006, 2006, 2006,
2006, 2006, 2006, 2006, 2007, 2007, 2007, 2007, 2007, 2007, 2007,
2007, 2007, 2007, 2007, 2007, 2007, 2007, 2007, 2007, 2008, 2008,
2008, 2008, 2008, 2008, 2008, 2008, 2008, 2008, 2008, 2008, 2008,
2008, 2008, 2008, 2009, 2009, 2009, 2009, 2009, 2009, 2009, 2009,
2009, 2009, 2009, 2009, 2009, 2009, 2009, 2009, 2010, 2010, 2010,
2010, 2010, 2010, 2010, 2010, 2010, 2010, 2010, 2010, 2010, 2010,
2010, 2010, 2011, 2011, 2011, 2011, 2011, 2011, 2011, 2011, 2011,
2011, 2011, 2011, 2011, 2011, 2011, 2011, 2012, 2012, 2012, 2012,
2012, 2012, 2012, 2012, 2012, 2012, 2012, 2012, 2012, 2012, 2012,
2012, 2013, 2013, 2013, 2013, 2013, 2013, 2013, 2013, 2013, 2013,
2013, 2013, 2013, 2013, 2013, 2013, 2014, 2014, 2014, 2014, 2014,
2014, 2014, 2014, 2014, 2014, 2014, 2014, 2014, 2014, 2014, 2014,
2015, 2015, 2015, 2015, 2015, 2015, 2015, 2015, 2015, 2015, 2015,
2015, 2015, 2015, 2015, 2015, 2016, 2016, 2016, 2016, 2016, 2016,
2016, 2016, 2016, 2016, 2016, 2016, 2016, 2016, 2016, 2016, 2017,
2017, 2017, 2017, 2017, 2017, 2017, 2017, 2017, 2017, 2017, 2017,
2017, 2017, 2017, 2017)), class = c("spec_tbl_df", "tbl_df",
"tbl", "data.frame"), row.names = c(NA, -450L))
答案 0 :(得分：1)
注意
> intersect(crime$CITY, district$CITY)
character(0)
同时
> intersect(crime$COUNTY, district$COUNTY)
[1] "adams county"
您的某些列（例如CITY）根本不重叠，因此您无法在这些向量上合并（合并）。