blankSummary: blankSummary Generate a summary table of blank analyses

In USGS-R/WQ-Review: Discrete water-quality data review and exploration toolbox

Description

Generates a summary table of blank analyses for all analytes in a qw.data list from readNWISodbc.

Usage

blankSummary(qw.data, STAIDS = "All", begin.date = NA, end.date = NA,
  multiple.levels = FALSE)

Arguments

qw.data	a qw.data list generated from readNWISodbc
STAIDS	A character vector of station IDs to summarize or All for all site ids in qw.data.Defaults to "All"
begin.date	Character string (yyyy-mm-dd) of beggining date to subset blank analyses. Leave blank for all analyses.
end.date	Character string (yyyy-mm-dd) of ending date to subset blank analyses. Leave blank for all analyses.
multiple.levels	Logical to analyze multiple reporting levels separetly. Default is FALSE.

Details

The dataframe returned contains a summary of blank detections for each constituent with the following statistics:

• num_blanks The number of blank samples collected

• num_detects The number of unqualified blank detections

• num_E_detects The number of blank detections with an E remark_cd (estimated)

• median_detected_value The median value of all detections

• max_detected_value The max value of all detections

• BD90.90 A statistic used for setting study reporting limits described by Fram and others, 2012. Briefly, the BD90.90 value is the concentration of a blank detection where there is at least a 90-percent confidence that the contamination in at least 90 percent of samples is less than this value.

Value

A dataframe of summary statistics for blank samples. See details.

References

Fram, M.S., Olsen, L.D., and Belitz, Kenneth, 2012, Evaluation of volatile organic compound (VOC) blank data and application of study reporting levels to groundwater data collected for the California GAMA Priority Basin Project, May 2004 through September 2010: U.S. Geological Survey Scientific Investigations Report 2012_5139, 94 p

Examples

data("exampleData",package="WQReview")
blankSummaryOut <- blankSummary(qw.data = qw.data,
             STAIDS = unique(qw.data$PlotTable$SITE_NO),
             begin.date = "2009-01-01",
             end.date = "2013-01-01",
             multiple.levels = FALSE)

USGS-R/WQ-Review documentation built on Nov. 12, 2019, 9:51 a.m.