cognitive review Flashcards
Counted the number of times each event occurs.
FREQUENCY DISTRIBUTION
Spread or variation of the data/score
MEASURES OF VARIABILITY
Identify the meaning of a phenomenon, experience for an individual participant
Data gathered directly from informants through interview or observation
QUALITATIVE STUDY DESIGN
Stability within an instrument
How well the items measure same Variable and yield similar results?
Cronbach’s alpha > 0.7
INTERNAL CONSISTENCY
Scale with equal intervals between the numbers
No true 0 point
Interval
Properly calibrated equipment & instruments
MINIMIZING MEASUREMENT ERROR
Coding categories: “Cookbook”
Break down data to sort/label in categories
CODING & DATA REDUCTION
Not given all the individuals in the population equal chances of being selected.
Risk for selection bias
Limitation of generalizations about findings
NON-PROBABILITY SAMPLING
Going forward (usually a long period of time)
Prospective/Longitudinal Design
Measured scores are incorrect in the same direction
Affects average score: Bias
Sources of error
SYSTEMATIC ERROR
Access one person suitable for study - Find other people
“Referral sampling”
Very good methods for sensitive subjects/issues
Example:
Found one mother of children with cystic fibrosis who lives in her neighborhood & asked her if she knows any other mothers of children with cystic fibrosis.
SNOWBALL SAMPLING
Not predict the direction of difference and/or relationship between Variables
Example:
There is a difference in the mammography rates between women who receive and do not receive the education.
Non-Directional Hypothesis: 2-tailed
Undesirable variables that influence the study outcome
Not the variables that are actually of interest.
EXTRANEOUS (CONFOUNDING) VARIABLES
Scores vary in a random way
Inconsistent data collection procedures by collector(s)
Not affect the average score
Affects variability around average score
RANDOM ERROR
Who: research assistant, trained nurse…etc.
Where: home, clinic, conference room…etc.
When: before and/or after intervention…etc.
How: interview, survey, observation…etc.
How often: once, every 3 weeks…etc.
COMPONENTS
Scale with equal intervals between the numbers
Absolute 0 point
Ratio
Two variables are related across a group of participants
CORRELATION STATISTICS
Categorize a variable
Nominal (Categorical)
How to measure the Variable/Concept?
Make decision for type of data to be collected
OPERATIONAL DEFINITION
Stability between Raters
Correlating Rater score
Percentage or Cohen’s kappa > 0.85
INTER-RATER RELIABILITY
Already collected data set by someone else for some other purposes
Patient record, Public/Commercial databases of health data, Registries, Government sources of health data .
SECONDARY DATA
General meaning of Variable/Concept
Perceived Susceptibility: One’s opinion of chances of getting a condition
CONCEPTUAL DEFINITION
Commonly used to investigate and identify the cause of certain condition/disease with small sample size
Example:
Rare type of cancer
Hepatitis outbreaks
CASE CONTROL DESIGN
PICO Approach
Population
Intervention
Comparison/Control
Outcome
Measurement of a group over time
Independent variable manipulated at some point in time
Enables the researcher to:
- Determine effectiveness of intervention
- Quantify timing of effects
Example:
Test effectiveness of planned behavior intervention to increase adherence of community mental health professionals to a national suicide prevention guideline
TIME SERIES DESIGN
Made up of people who are easy to reach.
Example:
Patients from the hypertension clinics of 2 local hospitals to explore medication adherence among HTN patients.
CONVENIENCE SAMPLING
Proportion/Rate in one sample against another
Relationship between two nominal/categorical variables
Chi-Square
Provide a high level of control
measure something
Enable the researchers to:
- Examine the effectiveness of interventions
- Measure changes over time
- Explore the relationship between variables and outcomes
QUANTITATIVE STUDY DESIGNS
Stability of measurement over time
Same measurement tool with the same participants at different time
Correlation coefficient >/- 0.5
TEST-RETEST RELIABILITY
Lack of time
Negative attitude toward research & EBP
Organizational constraints
Lack of skill to search literature and interpret evidence
Perception that lack of authority to change practice
Cost
Individual judgment/patient input devalued
BARRIERS TO EBP
Best used for many variation in variable being measured
Strata/Layers
Divide population into smaller groups
Take random sample from each stratum/group
STRATIFIED RANDOM SAMPLING
Face validity
Panel of experts review the items of instrumen
CONTENT VALIDITY
Assess if results from the sample can occur in a large population
INFERENTIAL STATISTICS