Definitions beginning with S

Five-digit WMO Station Identifier used by the Buoy Data Center since 1976. ID's can be reassigned to future deployments within the same 1 degree square.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: AFSS, Hourly Precipitation Data (HPD), Mesonet, RAWS, River Observing Station, Station Model

A record of all calls originated or received by a switching system. Note: SMDRs are usually generated by a computer.
ATIS - Cite This Source - This Definition
Browse Related Terms: address message, BIRRDS, call associated signaling (CAS), camp-on busy signal, nonblocking switch, off-net calling, Queue, queuing delay

A specified pattern for plotting, on a weather map, the meteorological symbols that represent the state of the weather at a particular observing station.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: AFSS, Hourly Precipitation Data (HPD), Mesonet, RAWS, River Observing Station, Station ID

The absolute air pressure at a given reporting station. The air pressure is directly proportional to the combined weight of all air in the atmosphere located in a column directly above the reporting site. Consequently, the station pressure may vary tremendously from one location to another in mountainous regions due to the strong variation of atmospheric pressure with height. Vertical variations of pressure range up to 150 mb per mile whereas horizontal variations are usually less than .1 mb per mile.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: AO, Arctic Oscillation, ARSI, element, Kilopascal, Mesohigh

The term applied to the basis of toll rate making which contemplates that the message toll service charge (telephone or TWX) covers the use made of all facilities between the originating station and the terminating station, including the stations, and the services rendered in connection therewith. [47 CFR Pt.36-A]
ATIS - Cite This Source - This Definition
Browse Related Terms: aeronautical advisory station, amateur station, Beacon, bridge-to-bridge station, experimental station, point-to-point transmission, port station, portable station, radiodetermination station, sounder prediction station, space station, station, station clock, station load, subordinate station, terrestrial station, transportable station, UNICOM station

Energy used in a generating plant as necessary in production of electricity. Includes energy consumed for plant light, power, and auxiliaries regardless of whether such energy is produced at plant or comes from another source.
Bureau of Reclamation - Cite This Source - This Definition
Browse Related Terms: biennial, Fuel replacement energy, Gross generation, Plant-use electricity, Pumped-storage plant, Pumping energy, Thermal-electric powerplant

Describes a mathematical measure of difference between groups. The difference is said to be statistically significant if it is greater than what might be expected to happen by chance alone. Also called significant.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: Cancer Statistics Review (CSR), confidence interval, Fast Stats, georeferenced statistics, Joinpoint software, mean, median, p-value, percent change, quartile, significant, spatial correlation

Describes a mathematical measure of difference between groups. The difference is said to be statistically significant if it is greater than what might be expected to happen by chance alone.
NCI: National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: annual percent change (APC), confidence interval, crude rate, Joinpoint software, percent change, spatial correlation, trends over time

A characteristic of a quantity such that, for an n-bit quantity, the probability of two values' repeating is less likely than or equal to the probability of two n-bit quantities' repeating at random. [After X9.62]
ATIS - Cite This Source - This Definition
Browse Related Terms: bit inversion, least significant bit, most significant bit

Time-division multiplexing in which connections to communication circuits are made on a statistical basis.
ATIS - Cite This Source - This Definition
Browse Related Terms: asynchronous time-division multiplexing (ATDM), framing, time-derived channel, time division

In relation to relevancy, statistically how well the content of the overall document matches the query. One measure is the number of times the query terms appear in the document, and how rare that term is within the complete corpus. Another is the proximity of the words in the document - how close they are to one another.
FAST - Cite This Source - This Definition
Browse Related Terms: Completeness, Context relevancy, Geo/Location, Query term weight, TF-IDF, weighted term search

That portion of a machine which contains the stationary (non-moving) parts that surround the moving parts (rotor).
Bureau of Reclamation - Cite This Source - This Definition
Browse Related Terms: Acidic, Acidified, aqueous, Bituminous, pH