CRONBACH'S ALPHA RELIABILITY ESTIMATOR Program: Cronbach - Analysis Output Title: Cronbach Example Data One (scores as person per row) Data read from file: CronbachDataOne.txt Program execution initiated at 15:53:31 on 13-Nov-2010 Program executed at 15:53:34 on 13-Nov-2010 RELIABILITY ESTIMATORS Cronbach's coefficient alpha Raw data 0.64548 Standardized data 0.716046 Average of the inter-item correlation coefficients, excluding item totals Raw data 0.264837 Standardized data 0.264837 Average of the inter-item correlation coefficients, including item totals Raw data 0.339143 Standardized data 0.350668 'NO RESPONSE' DELETIONS AND REPLACEMENTS No persons were deleted No items were deleted No 'no response' replacements were made Number of items used 7 Number of persons used 23 CORRELATION COEFFICIENTS Correlation coefficients between items - raw data item1 item2 item3 item4 item5 item6 item7 total item1 1.0 0.481491 -0.070094 0.205071 0.197667 0.561255 0.788254 0.925569 item2 0.481491 1.0 0.339464 0.318519 0.102776 0.355933 0.47796 0.624546 item3 -0.070094 0.339464 1.0 0.128446 -0.019968 -0.038169 0.165316 0.165408 item4 0.205071 0.318519 0.128446 1.0 0.334525 0.178737 0.243441 0.397528 item5 0.197667 0.102776 -0.019968 0.334525 1.0 0.060363 0.184914 0.265358 item6 0.561255 0.355933 -0.038169 0.178737 0.060363 1.0 0.565669 0.646538 item7 0.788254 0.47796 0.165316 0.243441 0.184914 0.565669 1.0 0.909484 total 0.925569 0.624546 0.165408 0.397528 0.265358 0.646538 0.909484 1.0 Average inter-item correlation coefficient (excluding total) 0.264837 Standard deviation of the inter-item correlation coefficient (excluding total) 0.220264 Average inter-item correlation coefficient (including total) 0.339143 Standard deviation of the inter-item correlation coefficient (including total) 0.270147 Correlation coefficients between items - standardized data item1 item2 item3 item4 item5 item6 item7 total item1 1.0 0.481491 -0.070094 0.205071 0.197667 0.561255 0.788254 0.743141 item2 0.481491 1.0 0.339464 0.318519 0.102776 0.355933 0.47796 0.722586 item3 -0.070094 0.339464 1.0 0.128446 -0.019968 -0.038169 0.165316 0.353523 item4 0.205071 0.318519 0.128446 1.0 0.334525 0.178737 0.243441 0.565813 item5 0.197667 0.102776 -0.019968 0.334525 1.0 0.060363 0.184914 0.436979 item6 0.561255 0.355933 -0.038169 0.178737 0.060363 1.0 0.565669 0.630422 item7 0.788254 0.47796 0.165316 0.243441 0.184914 0.565669 1.0 0.804663 total 0.743141 0.722586 0.353523 0.565813 0.436979 0.630422 0.804663 1.0 Average inter-item correlation coefficient (excluding total) 0.264837 Standard deviation of the inter-item correlation coefficient (excluding total) 0.220264 Average inter-item correlation coefficient (including total) 0.350668 Standard deviation of the inter-item correlation coefficient (including total) 0.254988 ITEMS: MEANS, STANDARD DEVIATIONS, SKENESS AND KURTOSIS Raw data item mean standard moment median quartile kurtosis dichotomous deviation skewness skewness skewness excess percentage item1 37.913044 5.133783 -0.078854 -0.635179 -1.0 -1.381333 26.1 item2 2.434783 0.843482 1.3402 1.546384 NaN 1.907842 87.0 item3 -0.043478 1.021508 0.085126 2.809147 -1.0 -2.036232 100.0 item4 3.652174 1.265224 0.666918 1.546384 NaN -0.77486 60.9 item5 1.826087 0.387553 -1.682798 -1.346238 NaN 0.78833 100.0 item6 0.130435 1.01374 -0.257334 -2.573339 -1.0 -1.977258 100.0 item7 1.782609 3.063814 0.220583 -0.408698 -0.31579 -1.024748 13.0 ITEMS: MINIMA, MAXIMA, MEDIANS, RANGES AND TOTALS Raw data item minimum maximum median range total dichotomous percentage item1 30.0 46.0 39.0 16.0 872.0 26.1 item2 1.0 5.0 2.0 4.0 56.0 87.0 item3 -1.0 1.0 -1.0 2.0 -1.0 100.0 item4 2.0 6.0 3.0 4.0 84.0 60.9 item5 1.0 2.0 2.0 1.0 42.0 100.0 item6 -1.0 1.0 1.0 2.0 3.0 100.0 item7 -2.6 8.3 2.2 10.9 41.0 13.0 item mean standard variance minimum maximum range statistic deviation item means 6.813665 13.77325 189.702404 -0.043478 37.913044 37.956522 item standard deviations 1.818443 1.689632 2.854855 0.387553 5.133783 4.74623 item variances 5.753755 9.628394 92.705978 0.150198 26.355731 26.205534 item mimima 4.2 11.483902 131.88 -2.6 30.0 32.6 item maxima 9.9 16.154566 260.97 1.0 46.0 45.0 item medians 6.885714 14.218231 202.158095 -1.0 39.0 40.0 item ranges 5.7 5.603273 31.396667 1.0 16.0 15.0 item totals 156.714286 316.78474 100352.571429 -1.0 872.0 873.0 standardized data item mean standard moment median quartile kurtosis deviation skewness skewness skewness excess item1 0.0 1.0 -0.078854 -0.635179 -1.0 -1.381333 item2 0.0 1.0 1.3402 1.546384 NaN 1.907842 item3 0.0 1.0 0.085126 2.809147 -1.0 -2.036232 item4 0.0 1.0 0.666918 1.546384 NaN -0.77486 item5 0.0 1.0 -1.682798 -1.346238 NaN 0.78833 item6 0.0 1.0 -0.257334 -2.573339 -1.0 -1.977258 item7 0.0 1.0 0.220583 -0.408698 -0.31579 -1.024748 item minimum maximum median range total item1 -1.541367 1.575243 0.211726 3.11661 0.0 item2 -1.701023 3.041222 -0.515461 4.742245 0.0 item3 -0.936382 1.021508 -0.936382 1.95789 0.0 item4 -1.305836 1.855661 -0.515461 3.161497 0.0 item5 -2.131544 0.448746 0.448746 2.58029 0.0 item6 -1.115114 0.85778 0.85778 1.972893 0.0 item7 -1.430442 2.127215 0.136233 3.557657 0.0 item mean standard variance minimum maximum range statistic deviation item means 0.0 0.0 0.0 0.0 0.0 0.0 item standard deviations 1.0 0.0 0.0 1.0 1.0 0.0 item variances 1.0 0.0 0.0 1.0 1.0 0.0 item mimima -1.451672 0.394327 0.155493 -2.131544 -0.936382 1.195161 item maxima 1.561054 0.877626 0.770228 0.448746 3.041222 2.592476 item medians -0.044689 0.631767 0.39913 -0.936382 0.85778 1.794162 item ranges 3.012726 0.974854 0.950341 1.95789 4.742245 2.784355 item totals 0.0 0.0 0.0 0.0 0.0 0.0 DELETION OF ITEMS Raw data Standardized data Deleted item Alpha Correlation Average Average Alpha Correlation Average Average coefficient inter-item inter-item coefficient inter-item inter-item with total correlation correlation with total correlation correlation coefficient coefficient coefficient coefficient without totals with totals without totals with totals item1 0.564307 0.712932 0.226528 0.324016 0.637318 0.604855 0.226528 0.226528 item2 0.612878 0.565656 0.232362 0.323123 0.644909 0.576465 0.232362 0.232362 item3 0.664962 0.058533 0.337105 0.419843 0.75316 0.125805 0.337105 0.337105 item4 0.635443 0.276763 0.276855 0.364773 0.696703 0.372457 0.276855 0.276855 item5 0.655024 0.226821 0.313419 0.398673 0.732546 0.2192 0.313419 0.313419 item6 0.60184 0.57759 0.258519 0.343031 0.676575 0.453992 0.258519 0.258519 item7 0.405052 0.815971 0.209068 0.297807 0.6133 0.692393 0.209068 0.209068 No item deleted 0.64548 0.264837 0.339143 0.716046 0.264837 0.350668 INDIVIDUALS - raw data person mean standard minimum maximum range total deviation 1 7.557143 13.929807 1.0 39.0 38.0 52.9 2 5.528571 13.071179 -1.0 35.0 36.0 38.7 3 6.257143 12.756548 -1.2 35.0 36.2 43.8 4 5.585714 14.377115 -1.9 38.0 39.9 39.1 5 6.957143 14.67695 -1.0 40.0 41.0 48.7 6 8.742857 15.227044 1.0 43.0 42.0 61.2 7 8.514286 16.560538 1.0 46.0 45.0 59.6 8 6.285714 12.880402 -1.0 35.0 36.0 44.0 9 5.557143 13.160782 -2.1 35.0 37.1 38.9 10 5.014286 12.045805 -1.9 32.0 33.9 35.1 11 7.785714 14.259082 1.0 40.0 39.0 54.5 12 7.314286 14.929549 -1.0 41.0 42.0 51.2 13 4.771429 11.279733 -2.6 30.0 32.6 33.4 14 7.214286 14.100405 -1.0 39.0 40.0 50.5 15 5.828571 12.047367 -1.0 33.0 34.0 40.8 16 8.2 15.914773 -1.0 44.0 45.0 57.4 17 4.928571 12.001488 -1.5 32.0 33.5 34.5 18 8.9 15.26663 1.0 43.0 42.0 62.3 19 5.914286 10.825191 -1.0 30.0 31.0 41.4 20 8.357143 16.316439 -1.0 45.0 46.0 58.5 21 5.371429 11.388549 -1.0 31.0 32.0 37.6 22 8.1 15.944801 -1.0 44.0 45.0 56.7 23 8.028571 15.113097 -1.0 42.0 43.0 56.2 scores: person item1 item2 item3 item4 item5 item6 item7 1 39.0 2.0 1.0 3.0 2.0 1.0 4.9 2 35.0 2.0 -1.0 2.0 2.0 -1.0 -0.3 3 35.0 3.0 1.0 3.0 2.0 1.0 -1.2 4 38.0 2.0 -1.0 2.0 1.0 -1.0 -1.9 5 40.0 3.0 -1.0 3.0 2.0 -1.0 2.7 6 43.0 5.0 1.0 6.0 2.0 1.0 3.2 7 46.0 3.0 1.0 3.0 2.0 1.0 3.6 8 35.0 2.0 1.0 6.0 2.0 -1.0 -1.0 9 35.0 2.0 -1.0 4.0 2.0 -1.0 -2.1 10 32.0 2.0 -1.0 3.0 2.0 -1.0 -1.9 11 40.0 3.0 1.0 3.0 2.0 1.0 4.5 12 41.0 2.0 -1.0 4.0 2.0 1.0 2.2 13 30.0 2.0 -1.0 3.0 1.0 1.0 -2.6 14 39.0 3.0 1.0 3.0 2.0 -1.0 3.5 15 33.0 2.0 -1.0 3.0 2.0 1.0 0.8 16 44.0 2.0 -1.0 5.0 2.0 1.0 4.4 17 32.0 1.0 1.0 2.0 1.0 -1.0 -1.5 18 43.0 4.0 1.0 4.0 1.0 1.0 8.3 19 30.0 2.0 1.0 6.0 2.0 -1.0 1.4 20 45.0 2.0 -1.0 3.0 2.0 1.0 6.5 21 31.0 2.0 1.0 3.0 2.0 -1.0 -0.4 22 44.0 2.0 -1.0 5.0 2.0 1.0 3.7 23 42.0 3.0 -1.0 5.0 2.0 1.0 4.2 INDIVIDUALS - standardized data person mean standard minimum maximum range total deviation 1 0.360903 0.66838 -0.515461 1.021508 1.536969 2.526324 2 -0.667317 0.571462 -1.305836 0.448746 1.754582 -4.671217 3 0.134536 0.799827 -0.973495 1.021508 1.995003 0.94175 4 -1.027052 0.670303 -2.131544 0.016938 2.148482 -7.189367 5 -0.106024 0.731735 -1.115114 0.6701 1.785213 -0.742169 6 1.239774 0.922834 0.448746 3.041222 2.592476 8.678419 7 0.664442 0.637474 -0.515461 1.575243 2.090705 4.651094 8 0.031385 1.105851 -1.115114 1.855661 2.970775 0.219697 9 -0.525425 0.665624 -1.267247 0.448746 1.715993 -3.677972 10 -0.71249 0.587497 -1.201969 0.448746 1.650715 -4.987432 11 0.539445 0.518051 -0.515461 1.021508 1.536969 3.776117 12 0.123876 0.636128 -0.936382 0.85778 1.794162 0.86713 13 -0.887554 0.965677 -2.131544 0.85778 2.989323 -6.212878 14 0.183149 0.74468 -1.115114 1.021508 2.136621 1.282045 15 -0.276928 0.686447 -0.957003 0.85778 1.814782 -1.938496 16 0.422847 0.826492 -0.936382 1.185667 2.122049 2.959928 17 -1.06503 0.996966 -2.131544 1.021508 3.153052 -7.455211 18 0.713773 1.401331 -2.131544 2.127215 4.258759 4.996412 19 0.004156 1.196439 -1.541367 1.855661 3.397028 0.029093 20 0.32277 0.990999 -0.936382 1.539712 2.476094 2.259388 21 -0.390678 0.84381 -1.346579 1.021508 2.368087 -2.734744 22 0.390208 0.81098 -0.936382 1.185667 2.122049 2.731454 23 0.527234 0.671853 -0.936382 1.065287 2.001669 3.690635 scores: person item1 item2 item3 item4 item5 item6 item7 1 0.211726 -0.515461 1.021508 -0.515461 0.448746 0.85778 1.017487 2 -0.567426 -0.515461 -0.936382 -1.305836 0.448746 -1.115114 -0.679744 3 -0.567426 0.6701 1.021508 -0.515461 0.448746 0.85778 -0.973495 4 0.016938 -0.515461 -0.936382 -1.305836 -2.131544 -1.115114 -1.201969 5 0.406514 0.6701 -0.936382 -0.515461 0.448746 -1.115114 0.299428 6 0.990879 3.041222 1.021508 1.855661 0.448746 0.85778 0.462623 7 1.575243 0.6701 1.021508 -0.515461 0.448746 0.85778 0.593179 8 -0.567426 -0.515461 1.021508 1.855661 0.448746 -1.115114 -0.908217 9 -0.567426 -0.515461 -0.936382 0.274913 0.448746 -1.115114 -1.267247 10 -1.151791 -0.515461 -0.936382 -0.515461 0.448746 -1.115114 -1.201969 11 0.406514 0.6701 1.021508 -0.515461 0.448746 0.85778 0.886931 12 0.601303 -0.515461 -0.936382 0.274913 0.448746 0.85778 0.136233 13 -1.541367 -0.515461 -0.936382 -0.515461 -2.131544 0.85778 -1.430442 14 0.211726 0.6701 1.021508 -0.515461 0.448746 -1.115114 0.56054 15 -0.957003 -0.515461 -0.936382 -0.515461 0.448746 0.85778 -0.320714 16 1.185667 -0.515461 -0.936382 1.065287 0.448746 0.85778 0.854292 17 -1.151791 -1.701023 1.021508 -1.305836 -2.131544 -1.115114 -1.071413 18 0.990879 1.855661 1.021508 0.274913 -2.131544 0.85778 2.127215 19 -1.541367 -0.515461 1.021508 1.855661 0.448746 -1.115114 -0.12488 20 1.380455 -0.515461 -0.936382 -0.515461 0.448746 0.85778 1.539712 21 -1.346579 -0.515461 1.021508 -0.515461 0.448746 -1.115114 -0.712383 22 1.185667 -0.515461 -0.936382 1.065287 0.448746 0.85778 0.625818 23 0.796091 0.6701 -0.936382 1.065287 0.448746 0.85778 0.789014 ALL SCORES - raw data mean standard minimum maximum range overall deviation total 6.813665 13.006011 -2.6 46.0 48.6 1097.0 ALL SCORES - standardized data mean standard minimum maximum range overall deviation total 9.447239E-17 0.981071 -2.131544 3.041222 5.172766 0.0