23 Msmt and Instrumentation Flashcards Preview

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Flashcards in 23 Msmt and Instrumentation Deck (24)
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1
Q

what is operationalization?

A

define how variable will be measured–make operational definition

2
Q

when describing how measures taken, need to consider:

A

allow others judge adequacy and appropriateness, complete enough to let others replicate

3
Q

objective measures are:

A

measures of quantities/qualities with equipment

4
Q

what are subjective measures?

A

ratings or judgements of quantities and qualities by humans

5
Q

examples of some quantities/qualities more suitable for subjective?

A

taste, degree of salt/sweet

6
Q

observed value =

A

true value +/- error

7
Q

desirable properties of msmt tools correspond to:

A

reliability, validity, practicability, applicability

8
Q

ways to evaluate reliability?

A

test-retest, inter-observer, internal consistency

9
Q

what is test retest?

A

make same test twice, correlate one with other, r>0.8 is good. If subjective, rate same variable twice

10
Q

what is internal consistency?

A

extent to which results on diff items correlate when msmt tool/test has multiple items

11
Q

if don’t have gold standard to determine validity, how to do this?

A

have some procedures to evaluate test validity, like compare diff methods

12
Q

how to assess for validity?

A

content validity, sensitivity and specificity, predictive validity

13
Q

what is content validity?

A

determine if all content has been tested

14
Q

what is sensitivity?

A

proportion of ppl who test positive correctly

15
Q

what is specificity?

A

proportion of ppl who test negative correctly

16
Q

what is predictive validity?

A

ability of test to predict future values of it or another test

17
Q

example of predictive validity

A

a rating scale x for selecting patients likely to respond to treatment, rating scale y evaluate effectiveness of treatment, determine correlation of x with y

18
Q

measuring instruments/procedures developed w/ known lvls reliability and validity

A

standardized measures and tests

19
Q

measure or categorize values of variable with ___ when only use numbers as labels and just have math of = or not =

A

nominal scales

20
Q

rank ordering of values of a variable, can make statements about rank but not about size of difference

A

ordinal scales

21
Q

continuous scale with defined intervals, with arbitrary rather than absolute zero point, enabling ID of equal intervals between msmt values

A

interval scales

22
Q

zero is not arbitrary in this scale

A

ratio scales

23
Q

these scales produce quantitative msmts

A

interval and ratio (higher scale allows more math ops)

24
Q

type of scale determines type of ____ appropriate

A

statistic