XCALIBRE (tm) for Windows -- Version 1.00 Page 1 Copyright (c) 1995 by Assessment Systems Corporation, All Rights Reserved Marginal Maximum-Likelihood IRT Parameter Estimation Program XCALIBRE Analysis from Data File: C:\WINDOWS\ESCRIT~1\XCALIBRE\XCALWIN\EXTROV.TXT Date:  Time: 11,53 ******************** ANALYSIS SUMMARY INFORMATION ******************** Data (Input) File: C:\WINDOWS\ESCRIT~1\XCALIBRE\XCALWIN\EXTROV.TXT Analysis Output File: C:\WINDOWS\ESCRIT~1\XCALIBRE\XCALWIN\EXTROV.OUT Score Output File: NONE Item Name File: NONE Statistics Output File: NONE ***** CONFIGURATION INFORMATION ***** Item Parameter Priors: COMMON Allow Priors to Float: YES IRT Model Used: 2-parameter Maximum Number of Loops: 12 Starting Prior Distribution Moments: Mean SD a 0.7500 0.1200 b 0.0000 1.0000 c 0.0000 0.0000 NOTE: *** will be printed when the c standard error value > 0.10 XCALIBRE (tm) for Windows -- Version 1.00 Page 2 Copyright (c) 1995 by Assessment Systems Corporation, All Rights Reserved Marginal Maximum-Likelihood IRT Parameter Estimation Program XCALIBRE Analysis from Data File: C:\WINDOWS\ESCRIT~1\XCALIBRE\XCALWIN\EXTROV.TXT Date: dpT Time: 11,53 The input was from file: C:\WINDOWS\ESCRIT~1\XCALIBRE\XCALWIN\EXTROV.TXT The number of items was: 6 There was no item linkage The key was: 222222 The numbers of alternatives were: 222222 The inclusion specifications were: YYYYYY The maximum parameter change on loop 1 was 0.767 The maximum parameter change on loop 2 was 0.057 The maximum parameter change on loop 3 was 0.060 The maximum parameter change on loop 4 was 0.041 Mean Number-Correct Score = 3.659 Number-Correct Standard Deviation = 1.558 K-R 21 Reliability = 0.533 The number of examinees was 3631 Final Parameter Summary Information: Mean SD Theta 0.00 1.00 a 0.68 0.31 b -0.49 0.55 c 0.00 0.00 XCALIBRE (tm) for Windows -- Version 1.00 Page 3 Copyright (c) 1995 by Assessment Systems Corporation, All Rights Reserved Marginal Maximum-Likelihood IRT Parameter Estimation Program XCALIBRE Analysis from Data File: C:\WINDOWS\ESCRIT~1\XCALIBRE\XCALWIN\EXTROV.TXT Date: V Ѐ~ Time: 11,53 FINAL ITEM PARAMETER ESTIMATES Item Lnk Flg a b c Resid PC PBs PBt N Item name ---- --- --- ----- ----- ----- ----- ----- ----- ----- ------ --------- 1 0.88 -0.86 0.00 0.84 0.69 0.62 0.68 3631 2 0.41 -0.62 0.00 1.19 0.59 0.50 0.41 3631 3 1.17 -0.83 0.00 0.52 0.70 0.65 0.76 3631 4 0.87 -1.15 0.00 0.99 0.75 0.60 0.64 3631 5 0.46 0.32 0.00 1.32 0.45 0.50 0.45 3631 6 P 0.29 0.19 0.00 1.63 0.48 0.44 0.28 3631 XCALIBRE (tm) for Windows -- Version 1.00 Page 4 Copyright (c) 1995 by Assessment Systems Corporation, All Rights Reserved Marginal Maximum-Likelihood IRT Parameter Estimation Program XCALIBRE Analysis from Data File: C:\WINDOWS\ESCRIT~1\XCALIBRE\XCALWIN\EXTROV.TXT Date: V 11,53 Time: 11,53 ITEM PARAMETER ESTIMATES W/STANDARD ERRORS a b c Item Lnk Flg a error b error c error Resid Item name ---- --- --- ----- ----- ----- ----- ----- ----- ----- --------- 1 0.88 0.031 -0.86 0.030 0.00 N/A 0.84 2 0.41 0.047 -0.62 0.052 0.00 N/A 1.19 3 1.17 0.031 -0.83 0.025 0.00 N/A 0.52 4 0.87 0.031 -1.15 0.032 0.00 N/A 0.99 5 0.46 0.049 0.32 0.046 0.00 N/A 1.32 6 P 0.29 0.070 0.19 0.069 0.00 N/A 1.63 XCALIBRE (tm) for Windows -- Version 1.00 Page 5 Copyright (c) 1995 by Assessment Systems Corporation, All Rights Reserved Marginal Maximum-Likelihood IRT Parameter Estimation Program XCALIBRE Analysis from Data File: C:\WINDOWS\ESCRIT~1\XCALIBRE\XCALWIN\EXTROV.TXT Date: V 11,53 Time: 11,53 ITEM ANALYSIS Endorsement Rate Item-Theta Corr. Item 1 2 Oth 1 2 Oth ---- --- --- --- --- --- --- 1 31 69~ -67 68~ -2 2 40 59~ 1 -41 41~ -3 3 29 70~ -76 76~ -5 4 25 75~ 1 -64 64~ -4 5 55 45~ -45 45~ 6 52 48~ 1 -27 28~ -2 XCALIBRE (tm) for Windows -- Version 1.00 Page 6 Copyright (c) 1995 by Assessment Systems Corporation, All Rights Reserved Marginal Maximum-Likelihood IRT Parameter Estimation Program XCALIBRE Analysis from Data File: C:\WINDOWS\ESCRIT~1\XCALIBRE\XCALWIN\EXTROV.TXT Date: IT~1\XCALIBRE\XCALWIN\EXTROV.OUT Time: 11,53 Test characteristics: K-R 21 Expected Average Reliability Information Information 0.533 1.407 1.031 Test Information Curve 4.0 I I I I I I I I I I 3.0 I I I I I I n I f I ** o I ** ** r I * * m I * * a 2.0 I * t I * * i I * o I * * n I * I * * I * I * * I * * I * 1.0 I * ** I * * I * * I * ** I ** * I * *** I ** *** I ***** I ******** I * I--------------------------------------------------------------- -3.0 -2.0 -1.0 0.0 1.0 2.0 3.0 ability XCALIBRE (tm) for Windows -- Version 1.00 Page 7 Copyright (c) 1995 by Assessment Systems Corporation, All Rights Reserved Marginal Maximum-Likelihood IRT Parameter Estimation Program XCALIBRE Analysis from Data File: C:\WINDOWS\ESCRIT~1\XCALIBRE\XCALWIN\EXTROV.TXT Date: ,53 Time: 11,53 Test Characteristic Curve 1.00 I I I I ****** I ***** E I *** s I **** t I ** i I *** m I ** a 0.75 I * t I ** e I * d I ** I * P I * r I * o I * p I * o I * r 0.50 I * t I * i I * o I n I * I * C I * o I * r I * r I ** e 0.25 I * c I * t I ** I * I ** I *** I *** I * I I I--------------------------------------------------------------- -3.0 -2.0 -1.0 0.0 1.0 2.0 3.0 ability Elapsed Time: 28 seconds