Which of the following is true of dependent variables?
A dependent variable can only have a numerical value.
B. A dependent variable cannot have more than 2 values.
C. A dependent variable can be binary.
D. A dependent variable cannot have a qualitative meaning.
查看答案
The dummy variable coefficient for a particular group represents the estimated difference in intercepts between that group and the base group.
A. 对
B. 错
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