Qualitative and Quantitative methods Flashcards
why use observational methods
questionnaires limited applicability
- apparatus limits generalisability
- context-dependent behaviour infeasible in controlled environments
steps of observational research
observe informally ask questions choose measures choose recording method design experiment run experiment analyse publish ask more questions
choosing measures in observation
operational hypothesis or ostensive definitions
events or states
what is a ostensive definition
provide examples through pictures or diagrams along with descriptions of behaviour of interest
what is an ethogram
- full list of behavioural repertoire
- sometimes denotes quantitative description of time animal spends doing activity
- refer to complete repertoires and coding schemes in specialised studies of subset of species’ or groups behaviour
types of measures in observation
- latency
- frequency
- rate
- duration
- proportion
scales of measurement
nominal
ordinal
interval
ratio-interval
recording methods, sampling rules
ad libitum
focal sampling
scan sampling
behaviour sampling
what is ad libitum sampling
- record what ever want, for as long as want
- potential bias: miss rare events of short duration and underestimate contribution to smaller, less conspicuous subjects
what is focal sampling
specific individual isolated
potential bias: can be large if focal subject seeks privacy for specific behaviours
what is scan sampling
number of individuals observed
potential bias: rare events of short duration underestimated, while common events overestimated
what is behaviour sampling
all-occurrences sampling
potential bias: overestimation of conspicuous events
recording methods, recording rules
time sampling: instantaneous, one-zero
continuous recording
potential biases of recording rules
time sampling: underestimate rare behaviours of short duration
continuous: high fidelity records, fewer categories coded, underestimate long duration behaviours as more likely truncated by end of session
coding schemes
applied to observations to produce data
data isn’t standardised so can refer to videos or numerical data
coding schemes: principles measurement
perfect doesn’t exist
measurements more/less accurate
measurements more/less precise
what does accurate refer to (coding schemes)
correct and valid measurement
what does precise refer to (coding schemes)
exactitude: reliable and replicable
coding schemes: principle design
mutually exclusive
exhaustive
use category ‘other’ for behaviours not interested in
reliability; coding scheme
- precision of coding scheme NOT precision of observer
- sloppy observer show low reliability but ambiguous from reliability estimate
- reliability only attributable to specific coding scheme applied by specific observer in specific spatiotemporal contexts
intra observer reliability
same observer codes same behavioural record at diff times
how consistent observer is
inter observer reliability
different observers independently code same behavioural record at same/different times
-how similar different observers code
consensus measures of inter observer reliability
- assumption that two or more coders can come to exact agreement
- percentage agreement: not correct for random choice
- cohens kappa: proportion of agreement after correct fro random choice
consistency measures of inter observer reliability
assumption that it’s unnecessary for identical interpretation
- correlation coefficient: doesn’t take into accoutn variance between coders
- cronbachs a: corrects for variance, estimates reliability for two+ coders
equation for percentage agreement
A / A + D
A is agreed
D is disagreed
equation for cohen’s kappa
Pa - Pc / 1 - Pc
Pc = P(yes) + P(no)
Pa is proportion of observed agreement
Pc is expected agreement
must be 0.6+ to be good enough
advantage of self report
own opinions
gather large amount of data
economic
time effective
sources of bias in self report
social desirability
acquiescent response styles
careless responding
how can you avoid bias in self report
- avoid presenting options as more desirable
- use indirect items
- confidentiality and anonymity
- change between positive and negative items
- reverse phrased items
- antonymic expression
- direct negation
what is a nomothetic or idiographic research question
nomothetic: relating to discovery of general laws, quantitative
idiographic: relating to study of particular facts or processes, qualitative
what are structured, semi-structured and unstructured interviews
structured: exact same for everyone, could be written
semi: set topics and some basic items for everyone
unstructured: general themes and issues that want to discuss