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112 Terms

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nominal

no implied categories
no value
no order
ex- race, sex
non parametric

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ordinal

adds meaning and order
rank
no equal distance
non parametric

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interval

0 is arbitrary
equal distance but no 0
ex- temperature
parametric

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ratio

0 means something
ex- weight and pulse rate
parametric

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reliability

consistency

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validity

accuracy

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high validity means

high reliability

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inter rater reliability

how consistent raters evaluate or judge a IV

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test stability

whether the measure is stable over time
measuring something multiple times yields a consistent value
gets closer to the truth
stability over time

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internal consistency

how well the items on the measure work together to produce similar scores
internal consistency

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how to measure inter rater reliability

pearson product correlation or pearson's r

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how to measure test- rest reliability

pearson product correlation or pearson's r

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how to increase inter rater reliability

ensure proper training among raters
protocols are clear
rating is consistent

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how to increase test stability

sufficient number of questions
ensure questions are easily understood
increase your sample size

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face validity

does a test look like what it is supposed to test

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content validity

addresses how well test questions match the content or subject area they are intended to asses
opinion based

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predicative validity

tells you how well a certain measure can predicts future behaviors or performance

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convergent validity

the degree to which a construct measure converges with other measures that should be measuring the same thing

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discriminant validity

the degree to which a construct measure diverges from other measures that purport to be measuring something different

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statistical significance testing doesn't tell us about what

strength or magnitude

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random sampling error

the natural deviations that occur when randomly sampling from the population
expect fluctuation

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bias

flawed sampling procedures whereby the researcher does not use a representative sample
not naturally occurring

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sampling errors start with

random sampling error & bias

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sampling distribution

the distribution of a sample statistic that would be obtained if all possible samples of the same size were drawn from a given population

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central limit theorem suggests

the mean of the sampling distribution will equal the mean of the population
as the sample size increases, the standard deviation of the sample distribution decreases

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statistical significance testing

quantify whether a result is likely due to chance (random sampling error) or due to some factor of interest

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null hypothesis

no difference between the two groups

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alternative hypothesis

there is a difference

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type 1 error

reject the null when there is actually no difference between the two groups/ alpha/ level of significance
(rejected and shouldn't have)

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type 2 error

when we fail to reject a null when it is actually false (doesn't reject the null when you should've)
beta

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power

the ability of the test to correctly reject a null when it is false

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a p value that is less than or equal to 0.05 or 0.01 is

statistically sig and you reject the null

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a p value that is greater than 0.05 or 0.01 is

not statistically significant and fail to reject the null

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as sample size increases ...

standard error decreases and distributions become more clustered around the population statistic

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a really big sample can be

not clinically or practically useful

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what is the big three

statistical significance testing
effect size
confidence intervals

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Probability

communicated by statistical significance by telling us how likely the current result would be if the null were true

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strength

communicated by effect size by telling us the magnitude of the experimental effect, or relationship, or odds between variables

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precision

communicated by confidence intervals by providing a range of plausible values for the population parameter being estimated

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effects sizes different tests

cohens d or hedges g
pearsons r or point biserial
odds ratio

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cohens d or hedges g

standardized mean difference
estimate the magnitude of standardized differences between two group means

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which has a bias correction for small samples

hedges g

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cohens d or hedges g no effect

0.0

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cohens d or hedges g small

+/- 0.2

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cohens d or hedges g medium

+/- 0.5

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cohens d or hedges g large

+/- 0.8

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pearson's r

correlation/association
measures the strength of a linear relationship between continuous variables

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point biserial

correlation/association
measure the strength of a relationship between one dichotomous and one continuous

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pearsons r or point biserial no effect

0.0

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pearsons r or point biserial small

+/- 0.1-0.3

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pearsons r or point biserial medium

+/- 0.3-0.5

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pearsons r or point biserial large

+/- >0.5

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odds ratio

proportion
ratio of the probability that an outcome occurs to the probability that the outcome does not occur

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odds ratio of 1.0

no difference

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odds ratio greater than 1

positively related

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odds ratio less than 1

negatively related

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if the lower limit of the CI is greater than the effect size predicted by the null we can conclude that

the effect is real

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CI establish

if an effect occurred
if effect was positive or negative
the precision of the estimate

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standardized mean difference studies

null = 0

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correlation/association studies

null = 0

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proportion studies

null = 1

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between subjects

subjects get 1 level of IV only, comparison is between different groups of same level

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within subjects

all subjects are in all levels and are compared against themselves

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if DV meets statistical assumptions the data is

parametrical (ratio interval)

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qualitative research examines the

depth of a topic

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quantitative research examines the

breadth of a topic

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grounded theory

how a theory is generated and constructed

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phenomenology

how someone makes sense and or gives meaning to things that happen

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ethnography

describes aspects of a culture
researcher inserts themselves into the culture

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types of basic qualitative research validities

confirmability, transferability, dependability, and credibility

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confirmability

findings are shaped by subjects and not researchers bias, motivation, or interest

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transferabilitiy

showing that findings have applicability in other contexts
can they describe the context of the study?

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dependability

findings are consistent and could be replicated

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credibility

confidential
truth of the findings

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external validity best matches with

transferability

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internal validity best matches with

confirmability

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construct validity best matches with

dependability

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audit trail

description of the decisions and steps researchers made through the project

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peer debriefing

working with others who have an impartial view as a way to uncover bias and test the hypothesis

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triangulation

multiple methods (sources or researchers) to confirm one common thing

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prolonged engagement

cornerstone of qualitative research
spending time in the field to understand a culture, social setting, or interest

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reflexivity

examining one's attitudes and judgments and how that affects the research process

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theoretical assumptions

moveable target
getting the same theme of information from multiple sources- saturated
interview till no more new information

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coding

trying to capture everything in an interview
looking for themes, topics
constantly compares

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interviews emphasize

subjects POV

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a telephone interview is usually what kind of data

quantitative

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it is typical for a phone interview to be

structured

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it is typical for a face to face interview to be

semi structured or unstructured

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an interview should be what

more conversational

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what questions should you avoid in an interview

leading

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what kind of initial questions should you begin with

what events lead to
what was your life like

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what are some intermediate questions

how did you feel about... when you first learned about it

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what are good concluding questions

how have your views changes
what is advice you would give to someone

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focus groups emphasize ...

a theme or topic and how people respond to each other

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how many in a focus group

6-8 with a plus and minus margin of 2

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tuskegee study

40 year study about syphilis where subjects did not know they had syphilis and were not given treatments when it became available
subjects were not allowed to quite

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national research act 1974

1. established a commission to identify basic ethical principles
2. established the IRB

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belmont report major 3

respect for persons
beneficence
justice

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respect for persons

informed consent, privacy

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beneficence

risk/benefit assessment
minimize risks