Branch of Quality Systems


Current Time Series Charts and Statistical Summaries
for NWQL LS 2080

The Time Series Charts
The charts provide OBSP recovery information for every analyte at different concentrations for every schedule OBSP assesses. The charts exhibit a Locally Weighted Scatterplot Smoothing (LOWESS) line. This line is used to help observe patterns and trends of the data over time. The time series charts also show bias and variability of the OSBP data. The most current time series charts in the table below will be overwritten periodically and will contain data that is currently being reviewed. All data is provisional and may change if the OBSP deems necessary.

There are two tables provided at the bottom of every time series chart that show statistical summaries.

Plotted Points Statistics Table
Description of the OBSP QA recoveries grouped by concentration level. The statistics in the table: mean, median, standard deviation and F-pseudosigma define bias and variability of the OBSP recoveries.

Sample Statistics Table
Counts (N) - The quantity of the variety of items.
Plotted - This number equals the total number in the above table.
Estimated Values - There are a number of reasons the laboratory will estimate (E) a result. If there are 100% of the results estimated the analyte is identified as a permanently estimated compound (analyte name in time series chart will be red).
Deleted Values - The laboratory may delete an entire sample or a single analyte for a number of reasons.
Spiked, Censored - A term for those samples that were spiked and correctly reported as less than a reporting level (possibly a raised reporting level) - the expected concentration was at a lower concentration than the censored result provided by the laboratory.
Spiked - The number of times the OBSP has submitted this analyte to the NWQL.
False Negative - The number of times the laboratory reports this analyte as not present in the sample when it is there.
Not Spiked - The number of times the OBSP has submitted a sample to the appropriate schedule, without this analyte.
False Positive - The number of times the laboratory reports this analyte as present when it is not in the sample.

The charts and data that you might secure from this U.S. Geological Survey (USGS) web page (identified as "OBSP") have not received official USGS approval and as such are provisional and subject to revision. The charts and data are released on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from its authorized or unauthorized use.

Lab Schedule 2080 - Pharmaceuticals by HPLC-MS, Water, Filtered
Choose an analyte below or click here for all analytes sorted by NWQL parameter code Parameter CAS#
1,7-Dimethylxanthine 6203000021 611-59-6
Acetaminophen 6200000021 103-90-2
Albuterol 6202000021 18559-94-9
Caffeine 5030500059 58-08-2
Carbamazepine 6279300021 298-46-4
Codeine 6200300021 76-57-3
Cotinine 6200500059 486-56-6
Diltiazem 6200800021 33286-22-5
Diphenhydramine 6279600021 147-24-0
Dehydronifedipine 6200400021 not assigned
Sulfamethoxazole 6202100021 723-46-6
Thiabendazole 6280100021 148-79-8
Trimethoprim 6202300021 738-70-5
Warfarin 6202400021 81-81-2

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Page Last Modified: March 26, 2018