Model | Dimensions | ||
---|---|---|---|
Number | Terms | Data Set 1 (LPDI) | Data Set 2 (CTSR) |
1 | None | Unidimensional (17 parameters) | Unidimensional (25 parameters) |
2 | Tier | Two dimensions: Tier 1; Tier 2 (19 parameters) | Two dimensions: Tier 1;Tier 2 (27 parameters) |
3 | Content | Two dimensions: Light Propagation; Visibility (19 parameters) | Four dimensions: Control of Variables; Combinatorial Reasoning; Proportional Reasoning; Probabilistic Reasoning (34 parameters) |
4 | Tier × Content | Four dimensions: Tier 1; Tier 2 × Light Propagation; Visibility (26 parameters) | Eight dimension: Tier 1; Tier 2 × Control of Variables; Combinatorial Reasoning; Proportional Reasoning; Probabilistic Reasoning (60 parameters) |