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Flashcards in Chapter 19 Deck (24):
1

ancestry approach

the reference lists of all the articles obtained so far checked to see if they cite any potentially relevant manuscripts that the search missed

2

Cohen's d

computed by subtracting the mean of the control group from the mean of the experimental group and dividing by the pooled standard deviation of two groups

3

combining studies

arriving at an overall, bottom-line answer to the focused hypothesis of interest

4

comparing studies

analyses that seek to document and explain variability among the effect sizes of the group of studies

5

differential mortality

a higher percentage of people being dropped from one group compared to the others

6

diffuse tests (tests of heterogeneity)

the goal is to determine whether there is significant variability among a group of effect sizes using a x^2 test

7

effect size

the strength or magnitude of an association in the population or degree of departure from the null hypothesis

8

electronic database

i.e. psycINFO or MEDLINE

9

focused question

group of studies all address the same hypothesis

10

focused tests

explicitly test hypotheses about the reasons for variability among effect sizes (advocates z test)

11

fundamental equation of data analysis

significance level = size of effect x size of study

12

invisible college

the network of researchers working on the topic

13

key words

words entered when one searches by subject

14

literature reviews

thorough search for all research conducted on the topic

15

literature search

identify the relevant electronic database then decide on key-words

16

meta-analysis

the results of studies are combined and analyzed quantitatively

17

moderator variable

third variable that affects correlation of two variables

18

narrative literature review

studies are described and summarized verbally

19

psychometric properties

construction and validation of measurement instruments

20

publication bias

the tendency to overstate the magnitude of a given effect because relevant non-significant findings or failures to replicate are not included in the review

21

publication lag

the interval between manuscript acceptance and publication // usually exceeds a year

22

standardized effect-size index

puts the results of all the studies on the same scales in order to compare results across studies meaningfully

23

statistical power

the likelihood of finding an effect that exists in the population (opposite of type II error)

24

thesaurus

lists the "official" phrasing for a key word topic and variations on the descriptor // most underused