2.2.4 causal model (Causal Model) is a model first, the technical path analysis (Path Analysis) in the study of genetics. A causal model that can study
.The form of text with complex variables. Major themes of this model is to build up from theory
.Relating to or research with. It is written in the style, linear model Each equation show เชิงผล causal relation between variables.2 aspects
.1) to form a single line system (Recursive Model) to a show. The causal relationship between the variables with lines linked with the direction of the cause in one direction without the relationship back
.2) system model for double line (Non-recursive Model) is a model showing the causal relationship between the variables. The direction relationship of variables within a variable may be causal เชิงผล both variable and ready.Steiner (1988 referred to in the liberalization is แช้ M. 2538: 7) has classified form into 2 types
1. Physical model (Physical Model). Divided into
1.1 form of something (such as Model of) model planes built real, but there are 1 thumbnail
.2 pattern for something (Model for) is designed as a prototype model products. To build a model as it gets up first and then produce the goods according to the model
2. Conceptual model (Conceptual Model) were divided into 2
.1 conceptual model of something (Conceptual Model of) is a model or a model created by จำลองมาจาก existing theories. Such a model created from the theory of the existence of the students in the school, etc. 2
.2 conceptual model to something (Conceptual Model for) is a model created to explain the theory or phenomena, such as The theory of natural selection.The type of form, etc. Conclusion the assortment of model will depend on the objective to explain the pattern,
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