DATA ANALYSI S Integrate data, calculate sums Calculate summary - - PowerPoint PPT Presentation

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DATA ANALYSI S Integrate data, calculate sums Calculate summary statistics (baywide and by region) Focusing on detects Plot data (box and whiskers and maps) SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011) SEPTEMBER 14, 2016

SLIDE 1

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

DATA ANALYSI S

Integrate data, calculate sums
Calculate summary statistics (baywide

and by region)

Focusing on detects
Plot data (box and whiskers and maps)

SLIDE 2

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

DATA ANALYSI S

Integrate data, calculate sums
Calculate summary statistics (baywide

and by region)

Focusing on detects
Plot data (box and whiskers and maps)
Exploratory analysis (identify data issues)

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 2 4 6 8

Cumulative Frequency Silver (mg/kg)

Silver in Sediment

1991 2001 2011

SLIDE 3

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

DATA ANALYSI S

Integrate data, calculate sums
Calculate summary statistics (baywide

and by region)

Focusing on detects
Plot data (box and whiskers and maps)
Exploratory analysis (identify data issues)
Comparison to screening values

Adverse effects in aquatic organisms (invertebrates and fish) Effects Range Low ( ERL) : Concentration at which effects rarely observed Effects Range Median ( ERM) : Concentration above which effects are frequently observed

SLIDE 4

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

DATA ANALYSI S

Integrate data, calculate sums
Calculate summary statistics (baywide

and by region)

Focusing on detects
Plot data (box and whiskers and maps)
Exploratory analysis (identify data issues)
Comparison to screening values
Statistical analysis (by region and time)
Geospatial analysis to illustrate notable

trends

SLIDE 5

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

DATA ANALYSI S

Integrate data, calculate sums
Calculate summary statistics (baywide

and by region)

Focusing on detects
Plot data (box and whiskers and maps)
Exploratory analysis (identify data issues)
Comparison to screening values
Statistical analysis (by region and time)
Geospatial analysis to illustrate notable

trends

Comparison to rest of Gulf of Maine

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SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

RESULTS: 2 0 1 0 -2 0 1 1 DATA BOX PLOTS

Median (half the data below and half above)

Concentration

“Outliers” or extreme values Half of the data fall within this range 75th percentile (3/ 4ths of data fall below this line) 25th percentile (1/ 4ths of data fall below this line) Whiskers show the full range of the data, w/ o outliers

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SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

RESULTS: 2 0 1 0 -2 0 1 1 DATA SEDI MENT GRAI N SI ZE

SLIDE 8

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

RESULTS: 2 0 1 0 -2 0 1 1 DATA EXAMPLE METALS

* * * * * *

* : statistically significant differences between regions

SLIDE 9

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

RESULTS: 2 0 1 0 -2 0 1 1 DATA

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SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

RESULTS: 2 0 1 0 -2 0 1 1 DATA PAHS

* * *

* : statistically significant differences between regions

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SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

RESULTS: 1 9 9 1 -2 0 1 1 CASCO BAY

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SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

RESULTS: 1 9 9 1 -2 0 1 1 CASCO BAY METALS

* * : statistically significant trend in concentration by time * * *

SLIDE 13

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

LEAD I N CASCO BAY, 1 9 9 1 -2 0 1 1

SLIDE 14

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)