Graphical Water Quality Database Browser - Stratified Random Sampling
To query the water quality database select an option from the "Compare by" drop down box. Select values for the drop down boxes for the query filters and click the submit query button to execute the data query. You can perform subsequent queries by refilling out the drop down boxes and clicking the submit query button.
The large chart shows predicted medians (red line on chart) with 90% confidence band (blue area on chart) estimated from log-transformed sample means using least squares regression. For more details, contact Brian Gray at email@example.com.