deAyala {mirt}

R Documentation

Description of deAyala data

Description

Mathematics data from de Ayala (2009; pg. 14); 5 item dataset in table format.

Author(s)

Phil Chalmers rphilip.chalmers@gmail.com

References

de Ayala, R. J. (2009). The theory and practice of item response theory. Guilford Press.

Examples

## No test: 
dat <- expand.table(deAyala)
head(dat)

##   Item.1 Item.2 Item.3 Item.4 Item.5
## 1      0      0      0      0      0
## 2      0      0      0      0      0
## 3      0      0      0      0      0
## 4      0      0      0      0      0
## 5      0      0      0      0      0
## 6      0      0      0      0      0

itemstats(dat)

## $overall
##      N mean_total.score sd_total.score ave.r  sd.r alpha SEM.alpha
##  19601            2.912          1.434 0.233 0.074 0.608     0.898
## 
## $itemstats
##            N  mean    sd total.r total.r_if_rm alpha_if_rm
## Item.1 19601 0.887 0.316   0.447         0.246       0.605
## Item.2 19601 0.644 0.479   0.688         0.439       0.510
## Item.3 19601 0.566 0.496   0.680         0.416       0.523
## Item.4 19601 0.427 0.495   0.673         0.405       0.529
## Item.5 19601 0.387 0.487   0.602         0.312       0.581
## 
## $proportions
##            0     1
## Item.1 0.113 0.887
## Item.2 0.356 0.644
## Item.3 0.434 0.566
## Item.4 0.573 0.427
## Item.5 0.613 0.387

## End(No test)

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