NASS: Timely & Accurate Agricultural Stats, Study notes of Statistics

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National Agricultural Statistics Service

Unbiased

Team Work

Accuracy

Timeliness

Confidentiality

Trust

Impartial

Service Security

United States Department of Agriculture

What is NASS?

National Agricultural Statistics Service

the statistical survey agency of the

U.S. Department of Agriculture

non-political

non-policy making

independent-objective-unbiased appraisers of U.S. agriculture

a cooperative statistical survey agency

State departments of agriculture

agricultural colleges & universities

National Agricultural Statistics Service

Mission:

to provide

timely, accurate and useful statistics

in service to U.S. agriculture

What does NASS do?

coordinate federal & state

agricultural statistics needs

statistical & survey consulting

other USDA agencies

other government agencies

private organizations

other countries

statistical research

Who is NASS?

Headquarters in Washington D.C.

12 regional offices serving 50 states

900 Federal employees

60 State employees

3,500 contract employees

Field Operations

NASS Ongoing Agricultural Statistics Program

Crops: Livestock: Other:

grains hay oilseeds cotton tobacco potatoes sugar other field crops citrus fruit non-citrus fruit nuts vegetables floriculture

crop progress acreage

• prospective plantings
• planted
• harvested yield & production
• forecasts
• final
• by utilization stocks disposition processing prices received by farmers agricultural chemical use

cattle hogs sheep goats equine poultry milk & dairy products aquaculture bees & honey mink

inventory

• total
• by class
• births
• deaths
• predator losses marketings slaughter production/disposition
• meat
• other products (milk, dairy products, wool, mohair, eggs, honey, etc.) prices received by farmers inventory/production values

number of farms land in farms land values cash rents agricultural labor

• number of workers
• hours worked
• wages paid cold storage
• holdings
• capacity cash receipts production expenditures

weekly ~ monthly ~ quarterly ~ annual

How does NASS produce statistics?

estimates based on data from

agricultural producers & agri-businesses

surveys

administrative sources

sample & census procedures

scientifically proven sampling techniques

lists of producers & businesses

segments of land

Statistical Inference

The process of using data obtained from a

sample to make estimates or test claims

about the characteristics of a population.

U.S. Farm Definition

Farm:

any place that produced and sold,

or normally would have produced and sold,

$1,000 or more of agricultural products

during the calendar year

~ currently about 2.2 million farms ~

Sampling Frame

• A listing of elements of the population

that allow one to select a sample with

known probabilities

• Effective if Complete and Unique
• NASS Frames: List, Area, Multiple Frame

NASS List Frame

How is it constructed?

sources for new names & data

growers organizations farm program lists state & local tax records state & local license records lists from other federal, state & local agencies newspaper & magazine articles

sources for updating names & data

on-going NASS surveys Census of Agriculture

NASS List Frame

How is it used?

➊ classify

identify farmers &/or agri-businesses

likely to have item(s) of interest

➋ stratify

group similar units together based on

size or amount of item(s) to be measured

➌ sample select units from each group

➍ survey collect data for selected units

➎ summarize expand data using probabilities of selection