The dummy variable coefficient for a particular group represents the estimated difference in intercepts between that group and the base group.
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A problem that often arises in policy and program evaluation is that individuals (or firms or cities) choose whether or not to participate in certain behaviors or programs.
A. 对
B. 错
以下不属于Internet常用的服务为()
A. E-mail
B. FTP
C. office
D. BBS
URL常用协议包括FILE、telent、FTP和()
A. HTTP
B. site
C. www
D. net
HTML文件由和文件体(body)两部分组成,在这两部分外面还要加上标签说明此文件是HTML文件,这样浏览器才能正确识别HTML文件。
A. 文件头(header);
B. 文件头(head);
C. 文件头(header);
D. 文件头(head);