EstrendSub: EstrendSub Data

In USGS-R/restrend: EStimate TRENDs

EstrendSub Data

Description

A subset of stations and water-quality constituents from Schertz and others (1991). The water-quality constituents were selected to cover a range of censoring levels. The stations were selected to represent a range of sampling intensity and duration.

Usage

EstrendSub

Format

Data frame with 5428 rows and 18 columns

Name	Type	Description
STAID	character	USGS station identifier
DATES	Date	Sample date
QI	numeric	Instantaneous streamflow at time of sample
QD	numeric	daily mean streamflow for sample
RN.organic	character	Remark code for organic nitrogen concentration
PN.organic	numeric	Organic nitrogen concentration in mg/L
RAmmonia	character	Remark code for ammonia concentration
PAmmonia	numeric	Ammonia concentration in mg/L as N
RKjeldahl	character	Remark code for Kjeldahl nitrogen concentration
PKjeldahl	numeric	Kjeldahl nitrogen concentration in mg/L
RTotal.P	character	Remark code for total (whole water) phosphorus concentration
PTotal.P	numeric	Total (whole water) phosphorus concentrationin mg/L
RCopper	character	Remark code for copper concentration
PCopper	numeric	Copper concentration in ug/L
RIron	character	Remark code for iron concentration
PIron	numeric	Iron concentration in ug/L
Calcium	numeric	Calcium concentration in mg/L
Chloride	numeric	Chloride concentration in mg/L

Source

The data include 8 water-quality constituents from 19 stations from Schertz and others (1991).

References

Schertz, T.L., Alexander, R.B., and Ohe, D.J., 1991, The computer program EStimate TREND (ESTREND), a system for the detection of trends in water-quality data: U.S. Geological Survey Water Resources Investigations Report 91-4040, 72 p.

Examples

## Not run: 
data(EstrendSub)
# Sampling date ranges for each station
with(EstrendSub, tapply(DATES, STAID, range))

## End(Not run)

USGS-R/restrend documentation built on Oct. 11, 2022, 6:10 a.m.