Lfs.txt: 2 facet rating scale: Liking for Science

The Liking for Science Questionnaire measures children's attitudes to science-related activities (RSA p.18). It is an attitude survey with Likert scale ratings of 0=Dislike, 1=Don't know, 2=Like.


Facets specifications and data (in file Lfs.txt):


Title = Liking For Science (Rating Scale Analysis p.18) ; the report heading line

Arrange = F,m ; tables output in Fit-ascending (F) and Measure-descending (m) order

Facets = 2 ; two facets: children and science items

Pt-biserial = y ;compute point-biserial

Positive = 1 ; children are measured with higher score=greater measure

Noncenter = 1 ; mean child measure floats, but mean item measure (facet 2) is set to zero

Usort = U ; sort residuals by unexpectedness

Vertical = 2A,1* ; Vertical rulers for facet 2 by name, then facet 1 by distribution

Yardstick = 0,5 ; Vertical rulers: 0 = horizontally, as many columns per facet as required, 

 ; 5 = vertically, 5 lines per logit

Model = ?,?,faces ; children interact with items to produce ratings on scale "faces"

 ; log(Pnik/Pnik-1) = Bn - Di - Fk

 ; Bn = ability of child n, Di = Difficulty of item i, Fk = Challenge of step k,

 ; Pnik = probability that child n on item i is scored k.


Rating (or partial credit) scale = faces,R2 ; definition of "faces" is "R2", a rating scale with categories 0 thru 2

0 = dislike ; category 0 of "faces" is labelled "dislike"

1 = don't know ; category 1 is "don't know"

2 = like ; category 2 is "like"

* ; end of scale definition for "faces"


Labels =

2,Activity ; facet 2 specified first, for convenience

1 = Watch birds ; first item

2 = Read about animals

| ; the other 21 items go here

24= Flowers live on ?

25= Talk about plants

* ; end of items


1-75 = ; 75 children for whom there is no more information

* ; end of child labels

data =

1, 1-25, 1,2,1,1,1,0,2,0,1,2,2,2,2,0,2,1,1,2,2,0,2,1,0,2,0 ; person 1 rated item 1 with 1, but item 2 with 2 etc.


75, 1-25, 1,2,0,0,1,1,0,1,1,2,1,2,2,2,2,1,0,2,2,0,2,0,0,1,0




Dvalues = 2, 1-25 ; place 1-25 in data facet 2 position in every line

1, 1,2,1,1,1,0,2,0,1,2,2,2,2,0,2,1,1,2,2,0,2,1,0,2,0 ; person 1 rated item 1 with 1, but item 2 with 2 etc.


75, 1,2,0,0,1,1,0,1,1,2,1,2,2,2,2,1,0,2,2,0,2,0,0,1,0

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