While private agencies and trade associations do gather and issue some statistics, they are limited to specific wants of specific industries. The vast bulk of statistics is gathered and disseminated by government. The overall statistics of the economy, the popular "gross national product" data that permits every economist to be a soothsayer of business conditions, come from government.
Furthermore, many statistics are by-products of other governmental activities: from the Internal Revenue bureau come tax data, from unemployment insurance departments come estimates of the unemployed, from customs offices come data on foreign trade, from the Federal Reserve flow statistics on banking, and so on. And as new statistical techniques are developed, new divisions of government departments are created to refine and use them.