Table 2: Summary statistics.

Summary of 30 measured person
Total Score Count Measure Model S.E. Infit Outfit
MNSQ ZSTD MNSQ ZSTD
MEAN 41.1   15.9    .12  .33 1.01 -.07 1.00 -.09
SEM .9   .1    .09  .00 .09 .25 .10 .25
P.SD 4.8   .3    .50  .01 .48 1.33 .53 1.32
S.SD 4.9   .3    .51  .01 .48 1.36 .53 1.34
MAX. 52.0   16.0    1.30  .36 2.46 3.33 2.77 3.59
MIN. 34.0   15.0    -.65  .32 .35 -2.62 .37 -2.43
 REAL RMSE .36
MODEL RMSE .33
S.E. OF Person MEAN= .09
TRUE SD .35
TRUE SD .38
SEPARATION .98
SEPARATION 1.15
Person RELIABILITY .49
Person RELIABILITY .57

Person RAW SCORE-TO-MEASURE CORRELATION = .98
CRONBACH ALPHA (KR-20) Person RAW SCORE “TEST” RELIABILITY = .56 SEM = 3.17.