Page 174 - Second language development of newly arrived migrant kindergarteners - Frederike Groothoff
P. 174

174 Chapter 8 Table 8.3: Fit of Different Polynomials (-2LL) for Changes in PPVT score (127 cases) as well as the Comparison of Consecutive Models. Comparison -2LL Models     ΔΧ2 Δdf PPVTII: PPVTI + β1Age1ij PPVTIII: PPVTII + e1ijAge1ij PPVTIV: PPVTIII + u10jAge1ij PPVTV: PPVTIV + β2Age2ij PPVTDEF: PPVTI + β1jAge1ij       951.08 a In addition to the intercept, variance components for differences within and between individuals are estimated. Based on this General Development Model we constructed Figure 8.2, in which both the average development of PPVT as well as the differences within and between individuals are represented (see Table 6.2 in Appendix 6 for the parameter estimates). The average receptive vocabulary at an age of 72 months was estimated as 68.48. Each month a child grew older, his receptive vocabulary increased by 0.99. Model PPVTI: β0ijcons a       1044.28 p         958.07 PPVTI vs PPVTII 955.84 PPVTII vs PPVTIII 946.25 PPVTIII vs PPVTIV 945.18 PPVTIV vs PPVTV 85.85 1 2.59 2 9.59 2 1.07 1 <.001 .27ns .01 .30ns              120 110 100  90  80  70  60  50  40  30 Growth PPVT Within 80% - Within 80% + Between 80% - Between 80% +            Age in Months Figure 8.2. Graphical Representation of the General Development Model of PPVT (127 cases) with 80% Reliability. Figure 8.2 shows that the effect of Age on PPVT scores is significant. The differences within individuals (represented by the striped lines in Figure 8.2) did not depend on Age. The differences between individuals (represented by the dotted lines in Figure 8.2) are a 48 52 56 60 64 68 72 76 80 84 88 92 96 100 104 PPVT Score 


































































































   172   173   174   175   176