You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is All of the following studies are 'analytical', except: and explain in detail?
Field trial is a type of experimental or interventional study. Coho study, case control study and ecological study are all types of analytical studies. Ref: Park's Textbook of Preventive and Social Medicine, By K. Park, 19th Edition, Page 58