计算相关性并对具有不同观察值数量的变量进行2SLS回归

如何解决计算相关性并对具有不同观察值数量的变量进行2SLS回归

要进行2SLS回归，我首先需要获取educ和fatheduc两个变量之间的相关性。

其中一个（仪器，fatheduc）具有一些NA值，而我不使用它们：

# Default Virtual Host configuration.

# Let Apache kNow we're behind a SSL reverse proxy
SetEnvIf X-Forwarded-Proto https HTTPS=on

<VirtualHost _default_:80>
  DocumentRoot "/opt/bitnami/apache/htdocs"
  # BEGIN: Configuration for letsencrypt
  Include "/opt/bitnami/apps/letsencrypt/conf/httpd-prefix.conf"
  # END: Configuration for letsencrypt
  # BEGIN: Support domain renewal when using mod_proxy without Location
  <IfModule mod_proxy.c>
    ProxyPass /.well-kNown !
  </IfModule>
  # END: Support domain renewal when using mod_proxy without Location
  # BEGIN: Enable HTTP to HTTPS redirection
  RewriteEngine On
  RewriteCond %{HTTPS} !=on
  RewriteCond %{HTTP_HOST} !^localhost
  RewriteCond %{HTTP_HOST} !^[0-9]+.[0-9]+.[0-9]+.[0-9]+(:[0-9]+)?$
  RewriteCond %{REQUEST_URI} !^/\.well-kNown
  RewriteRule ^/(.*) https://%{SERVER_NAME}/$1 [R,L]
  # END: Enable HTTP to HTTPS redirection
  <Directory "/opt/bitnami/apache/htdocs">
    Options Indexes FollowSymLinks
    AllowOverride All
    Require all granted
  </Directory>

  # Error Documents
  ErrorDocument 503 /503.html
  #Bitnami applications installed with a prefix URL (default)
  Include "/opt/bitnami/apache2/conf/bitnami/bitnami-apps-prefix.conf"
  # BEGIN: Support domain renewal when using mod_proxy within Location
  <Location /.well-kNown>
    <IfModule mod_proxy.c>
      ProxyPass !
    </IfModule>
  </Location>
  # END: Support domain renewal when using mod_proxy within Location
</VirtualHost>

Include "/opt/bitnami/apache/conf/bitnami/bitnami-ssl.conf"

但是现在我的两个变量的维数不同，这意味着找到相关性并进行第一阶段回归是不可能的。我该怎么办？

解决方法

educ和fathereduc中的行是同一个人的观察，因此您不能（不仅仅因为代码不会运行）从fathereduc中移除观察，而不是从educ中移除，您需要移除个人，即移除行来自两个变量。

educ = educ[-which(is.na(fathereduc))] #you need to run this before removing the NA's from fathereduc
fatheduc = na.omit(fatheduc)