Software Packages for Creel Survey Data Entry, Design and …zsu/MiCreel_SU_Mar_2006.pdf ·...
Transcript of Software Packages for Creel Survey Data Entry, Design and …zsu/MiCreel_SU_Mar_2006.pdf ·...
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Software Packages for Creel Survey Data Entry, Design
and Estimation
Zhenming Su, Ph.D.
Institute for Fisheries ResearchMichigan Dept. of
Natural Resources Ann Arbor, Michigan
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Topics
• What is creel survey?• Components of a creel survey.• Three software programs developed to aid
in the creel survey design, data entry and estimation.
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Creel SurveyA sampling technique to
gather data on angling activities and harvest by interviewing anglers or angler parties and making counts of the number of them.
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Data collected 1: counts of #anglers
6 AM
10 PM
Day
X
X
X
Count 1
Count 3
Count 2
mean #anglers x length(day)
Daily Fishing Effort:
Count 1Count 2Count 3
Mean: #anglers
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Catch rate = sum(catch) / sum(fishing time)
Data collected 2: angling trips
Angler trips and fish caught in these trips
Fishing time used
Fishing time used
Fishing time used
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The need for sampling
• Survey units: all the times available for fishing and all fishing trips in a survey period (such as a month) .
• Too expensive to make counts at all the times and to interview every angler on every day.
• Therefore, need to sampling aportion of the available fishing times and trips.
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Components of a creel survey
1. Planning and Design
2. Implementation 3. Data Analysis
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1. Survey methods
11.Survey Frame: all the fishing times and fishing trips.
13.Sample size: how many days should be sampled how many counts made per day in a survey period.
1. Plan and design a survey
A
D
B
C
Access Point Survey Roving Creel Survey
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Sample selection: scheduling
A
D
B
C
Access Point Surveys2. Work days 3. Site x Shift4. Count times
Roving Creel Surveys2. Work days 3. Shifts4. Interview start locations and directions5. Count times 6. Count start locations and directions
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MiCreel Designer• Automate and
standardize survey scheduling
• Generate random schedules for several creel survey methods, multiple sites and varying number of shifts
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2005 InlandWater Survey Schedule August 2005
SUNDAY MONDAY TUESDAY WENESDAY THURSDAY FRIDAY SATURDAY1 2
Shift:B s2 {3|CC} { 2CW|5:00 PM}
3 Shift:A s1 {1|CC} { 3CC|6:00 AM}
4 Shift:A s2 {2|CW} { 1CC|7:00 AM}
5 6 Shift:A s2 {2|CW} { 2CW|7:00 AM}
7 Shift:B s2 {3|CW} { 1CW|7:00 PM}
8 9 10 Shift:B s1 {2|CC} { 1CC|3:00 PM}
11 Shift:A s2 {3|CW} { 3CW|10:00 AM}
12 Shift:B s1 {1|CW} { 2CC|3:00 PM}
13 Shift:B s2 {1|CW} { 3CW|5:00 PM}
14 Shift:A s2 {3|CC} { 3CW|11:00 AM}
15 Shift:A s1 {1|CW} { 1CC|11:00 AM}
16 Shift:B s2 {2|CC} { 2CW|7:00 PM}
17 18 19 Shift:B s1 {3|CW} { 3CW|7:00 PM}
20 Shift:B s1 {2|CW} { 2CC|4:00 PM}
21 Shift:B s1 {1|CC} { 1CW|5:00 PM}
22 Shift:A s2 {3|CW} { 3CW|12:00 PM}
23 24 25 Shift:B s2 {1|CC} { 2CC|4:00 PM}
26 Shift:A s1 {2|CC} { 1CC|10:00 AM}
27 Shift:A s1 {2|CC} { 2CC|7:00 AM}
28 Shift:A s2 {3|CC} { 1CC|1:00 PM}
29 Shift:A s1 {1|CC} { 2CC|6:00 AM}
30 31
MiCreel Designer generated schedule
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2. Implementation: conducted by creel clerks
Requirements• Schedules are strictly followed.• Fish species are correctly identified.• Data are correctly entered.
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Data entry and recordScannable paper forms:.• Easily make input errors.• Hard to validate data entered.• Need time to scan the forms.
PDA data entry:• Less bubbles to fill.• Data entered can be validated
by several methods.• Data can be used right away
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MiCreel Data Assistant
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Features• Check the integrity of an
interview record: essential info must be entered.
• Check boxes, dropdown lists etc. are used to limit data entries.
• Range check, presence check, type check, and length check are applied to data entry
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Features
Fishing times are double checked
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3. MiCreel Estimation Program• Estimate fishing effort,
catch rate and catch by species for both access points and roving surveys.
• Generate reports for the survey.
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Summary• To plan, schedule, and execute an creel
survey, and to analyze the data is a demanding task.
• The scheduling and estimation programs greatly speed up the scheduling and estimation processes.
• The data entry program makes creel surveys a pleasure; it also ensures that data are correctly entered and validated.