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As an econometric model, the difference-in-difference method itself does not solve the endogeneity problem. The difference-in-difference method solves the endogeneity problem and essentially still relies on the exogeneity of intervention or policy impact itself. Form of double difference standard did (standard did) double difference. It is true that many people confuse schizophrenia with schizophrenia, but the two are actually very different. The English name of schizophrenia is schizophrenia, which is commonly known as schizophrenia or dissociative identity disorder. This can be done using spsspro. 1. What is double difference did (double difference method)? The principle of double difference did (double difference method) is to use observation data to simulate experimental research design. Its basic idea is to divide the survey sample into two.