combineIATfourblocks: Data analysis function: Collapses IAT permutations down prior...

In iatgen/iatgen: IATs for Qualtrics

Data analysis function: Collapses IAT permutations down prior to cleaning and analysis

Description

The first step after importing IAT data is collapsing the IAT data into two variables, typically labeled “compatible” and “incompatible.” Data analysis for the IAT requires comparing responses in the "compatible" blocks against performance in the "incompatible" blocks. However, the Qualtrics IAT runs four permutations of the IAT, counterbalancing left/right starting positions of both targets and categories (although research has consistently failed to find any left/right bias on the IAT; e.g., Greenwald et al., 1998; Nosek et al., 2005). As a result of these four permutations, any one block of trials (e.g., the compatible critical block) is distributed across four variables. Thus, it must be combined back together. This is done with the combineIATfourblocks function. Typically, four variables are of interest (compatible practice, incompatible practice, compatible critical, incompatible critical; see Greenwald et al., 2003; Nosek et al., 2005). Thus, we must create these four variables. The positioning of this information varies depending on the permutation. For example, if Target A starts on the right initially paired with the positive category (RP permutation), then the compatible block comes first and block 3 (RP.3) and block 4 (RP.4) contain compatible practice and critical blocks. However, if Target A starts on the right initially paired with negative (RN permutation), then the incompatible block comes first and this same information comes in blocks 6 and 7 (RN.6 and RN.7). The IAT analysis script (and examples below) have done the work of locating this information for you and are ready to run (so long as users do not alter variable names in the Qualtrics survey).

Usage

combineIATfourblocks(name1, name2, name3, name4)

Arguments

name1	A vector of responses representing a critical block (either compatible or incompatible) of trials for one of the four IAT permutations.
name2	A vector of responses representing a critical block (either compatible or incompatible) of trials for another of the four IAT permutations.
name3	A vector of responses representing a critical block (either compatible or incompatible) of trials for another of the four IAT permutations.
name4	A vector of responses representing a critical block (either compatible or incompatible) of trials for another of the four IAT permutations.

Value

Returns a single vector of responses that contains all four permutations collapsed into one vector.

References

Greenwald, A. G., McGhee, D. E., & Schwartz, J. L. K. (1998). Measuring individual differences in implicit cognition: The Implicit Association Test. Journal of Personality and Social Psychology, 74, 1464–1480. https://doi.org/10.1037/0022-3514.74.6.1464

Greenwald, A. G., Nosek, B. A., & Banaji, M. R. (2003). Understanding and using the Implicit Association Test: I. An improved scoring algorithm. Journal of Personality and Social Psychology, 85, 197–216. https://doi.org/10.1037/0022-3514.85.2.197

Nosek, B. A., Greenwald, A. G., & Banaji, M. R. (2005). Understanding and using the implicit association test: II. Method variables and construct validity. Personality and Social Psychology Bulletin, 31, 166–180. https://doi.org/10.1177/0146167204271418

See Also

See www.iatgen.wordpress.com for tutorials and files.

Examples

## Not run: 
### Collapse  IAT critical blocks  down ####
dat$compatible.crit <- combineIATfourblocks(dat$Q4.RP4, dat$Q18.LP4, dat$Q14.RN7, dat$Q28.LN7)
dat$incompatible.crit <- combineIATfourblocks(dat$Q7.RP7, dat$Q21.LP7, dat$Q11.RN4, dat$Q25.LN4)

### Collapse  IAT practice blocks ####
dat$compatible.prac <- combineIATfourblocks(dat$Q3.RP3, dat$Q17.LP3, dat$Q13.RN6, dat$Q27.LN6)
dat$incompatible.prac <- combineIATfourblocks(dat$Q6.RP6, dat$Q20.LP6, dat$Q10.RN3, dat$Q24.LN3)

## End(Not run)

iatgen/iatgen documentation built on Oct. 23, 2023, 10:55 a.m.