did模型(did模型适用范围)

矫情吗；* 2023-09-26 12:01 42阅读 0赞

## 心理学DID什么意思 ##

分离性身份识别障碍(Dissociative Identity Disorder，DID)，以前被称为多重人格障碍(Multiple Personality Disorder，MPD)，根据DSM-IV-TR，它是指一种戏剧性的分离性障碍，在这种障碍中显示出两种或更多的不同身份或人格状态，这些不同身份与人格交替以某种方式控制着患者的行为。理学最早起源于哲学，从哲学中分离出来形成一门独立的研究学科。是人类自我思维、行为方式认知和剖析，研究人类怎样感知外界信息和怎样进行信息内化处理的心理和行为的规律的科学。(注：一直以来心理学界都很难对“心理学”下一个准确的该概念，这是本人在心理学多年的研究中综合前辈的解释得的认识，如有不当之请各位斧正)

## 用stata处理did模型需要哪些数据 ##

这个刚回答过你啊，或者你的同学

给你一个例子：

cd "C:\\DATA\\Econ 562\\homework"

use eitc, clear

gen anykids = (children >= 1)

gen post93 = (year >= 1994)

mean work if post93==0 & anykids==0/\* value 1 \*/

mean work if post93==0 & anykids==1/\* value 2 \*/

mean work if post93==1 & anykids==0/\* value 3 \*/

mean work if post93==1 & anykids==1/\* value 4 \*/Then you must do the calculation by hand (shown on the last line of the R code).

(value 4 – value 3) – (value 2 – value 1)

Run a simple D-I-D Regression

Now we will run a regression to estimate the conditional difference-in-difference estimate of the effect of the Earned Income Tax Credit on “work”, using all women with children as the treatment group. This is exactly the same as what we did manually above, now using ordinary least squares. The regression equation is as follows:

Where is the white noise error term, and is the effect of the treatment on the treated — the shift shown in the diagram. To be clear, the coefficient on is the value we are interested in (i.e., ).