Spatial Analysis and Decision Assistance
Data Exploration
SADA provides methods for quick and easy data exploration. Data exploration
tools include:
- Statistical Summaries
- Database Query
- Data screening
For information concerning how to create a SADA file for your own data set, visit this
page.
The following series of pictures demonstrate how these tools can be used in a graphical
or interactive context. This first image is what you see after you successfully import a data set
into SADA. This data set is a randomly generated set of arsenic concentrations that will be used throughout the
web page to demonstrate SADA's capabilities.
Locations can be screened against Preliminary Remediation Goals (PRGs) for human health risk using the
screening feature. Here we
will screen the arsenic data set against residential PRGs as shown in the following menu.
To keep things interesting, we are screening the data set against the arsenic PRG for 1E-4 carcinogenic risk.
The sample locations with boxes around them exceed this PRG in the following figure.
The user may also draw a polygon around the a subset of the data. Here we have taken a subset of the
data using the polygon feature.
Summary statistics for the entire data set or a subset of the data can be extracted.
Here we show summary statistics for the data points defined using the polygon feature in the
previous figure.
Summary statistics can be exported as delimited files for import into spreadsheet or
wordprocessor programs. Other statistics that are available include the range, detection frequency,
maximum and minimum detected and non-detected values, and back transformed mean, variance, and UCL95.
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