Large non-agricultural data “refers to the non-agricultural employment, employment and unemployment, the three values, reflect the United States on the employment of non-agricultural population data index, measures the important basis of national economy, and released by the U.S. department of labor bureau of labor statistics, the release date for the first week of each month (daylight saving time 20:30, winter time) and on Friday.
Small nonfarm refers to the ADP employment number, which is released on the first Wednesday of each month. It’s an unofficial survey, but ADP is also a huge organization, with surveyors in every city in the world.