Description Usage Format References Examples

Visual lexical decision latencies for beginning readers (8 year-old Dutch children).

1 |

A data frame with 7923 observations on the following 13 variables.

`Word`

a factor for the words.

`Subject`

a factor for the subjects.

`LogRT`

a numeric vector with the log-transformed reaction time (in ms).

`Trial`

a numeric vector coding the rank of the trial in the experimental list.

`OrthLength`

a numeric vector coding the word's length in letters.

`LogFrequency`

a numeric vector with log-transformed frequency in Vermeer's frequency dictionary of Dutch children's texts.

`LogFamilySize`

a numeric vector with the log-transformed morphological family size count (with family members judged to be unknown to young children removed).

`ReadingScore`

a numeric vector with a score for reading proficiency.

`ProportionOfErrors`

a numeric vector for the proportion of error responses for the word.

`PC1`

a numeric vector for the first principal component of a PCA orthogonalization of the preceding 4 reaction times

`PC2`

a numeric vector for the second principal component of a PCA orthogonalization of the preceding 4 reaction times

`PC3`

a numeric vector for the third principal component of a PCA orthogonalization of the preceding 4 reaction times

`PC4`

a numeric vector for the fourth principal component of a PCA orthogonalization of the preceding 4 reaction times

Perdijk, K., Schreuder, R., Verhoeven, L. and Baayen, R. H. (2006)
*Tracing individual differences in reading skills of young children with
linear mixed-effects models*. Manuscript, Radboud University Nijmegen.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | ```
## Not run:
data(beginningReaders)
require(lme4)
require(optimx)
require(lmerTest)
beginningReaders.lmer = lmer(LogRT ~ PC1 + PC2 + PC3 + ReadingScore +
OrthLength + I(OrthLength^2) + LogFrequency + LogFamilySize +
(1|Word) + (1|Subject) + (0+LogFrequency|Subject) +
(0+OrthLength|Subject) + (0+PC1|Subject),
data = beginningReaders,
control=lmerControl(optimizer="optimx",optCtrl=list(method="nlminb")))
summary(beginningReaders.lmer)
## End(Not run)
``` |

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