第1节研究设计概述 、研究设计的类型 Dimension Design Degree of structure Structured stud Flexible study Control over independent Experimental study variable Quasi-experimental study Nonexperimental study Number of data collection Cross-sectional study points Longitudinal study Occurrence of independent Retrospective stud and dependent variables Prospective study现状与疑问 研究设计概述 二、研究设计的类型 Dimension Design Degree of structure Structured study Flexible study Control over independent variable Experimental study Quasi-experimental study Nonexperimental study Number of data collection points Cross-sectional study Longitudinal study Occurrence of independent and dependent variables Retrospecctive study Prospective study 第1节