Unfamiliar Fieldwork Flashcards
(23 cards)
Why do you calculate an average
- remove anomalies
- see general trends
- compare changes
Chloropleth Map
+ Easy to spot trends
_ Not useful for showing total values
Isoline Map
+ Can easily compare areas of equal value
_ difficult to read lines if they are close together
Proportional Symbols
+ Easy to interpret general trends
_ Clustering can make them hard to read
Bar Charts/Histograms
+ Clear comparison and trends
_ Doesn’t show the causes of the trends
Line Graph
+ Shows multiple sets of data
_ Too much data plotted makes it hard to read
Dispersion Graphs
+ Can easily spot anomalies in data
_ Can be time consuming to analyse
Flow Line
+ Shows connection between places
_ Overlapping makes it hard to read
Scatter Graphs
+ Line of best fit shows correlatio
_ ANalysis of the correlation can be subjective
Pictogram
+ easy to interpret
- Not suitable for continuos data
Pie Chart
+ Displays parts of a whole
- Cannot be used to show trends
Divided Bar Chart
+ Easy to see trends in large sets of data
_ Requires additional explanation
Random Sampling
Randomly choosing sites to collect data
Random sampling advantages
- Not Bias
- Can be done in a large area
Random Sampling disadvantages
- Sites can be clustered - data is not representive
- Can lead to unaccesible sites
Systematic Sampling
Picking sites every _____ metres
Systematic sampling advantages
- Good representation of an area
- Easier than random sampling
Systematic sampling disadvantages
- time consuming
- can lead to inaccessible sites
Stratified Sampling
Picking sites by topic
Stratefied Sampling advantages
- Flexible - fits with lots of different enquiries
- good comparison of different areas
Stratefied smapling disadvantages
- not suitable for questionares
- bias from person picking sites
How do you improve accuracy and reliabiltiy of data?
- more repeats
- calculate average
- remove anomolies
- wider range of data
- collect data at different times of year
- opinion based - ask for different views
How do you make data representative?
- collect at more sites to cover a larger area
- Ask lots of different people for a questionare - age/gender/religion
- collect data at different times of year2
