***Public and Private School Principle in the United States: A Statistical Profile, 1987-88 to 1993-94*****Table B16.-Standard errors for Table A16:  Average years of experience in education for public            and private school principals, by selected school and principal characteristics:             1987-88, 1990-91, and 1993-94**---------------------------------------------------------------------------------------------------------                                                       Professional experience in education                                         ----------------------------------------------------------------                                            Average years as teachers      Average years as principals                                         ------------------------------- --------------------------------School/principal characteristics           1987-88   1990-91   1993-94     1987-88   1990-91   1993-94---------------------------------------------------------------------------------------------------------PUBLICTotal                                        0.06      0.08      0.08        0.09      0.14      0.10 School level    Elementary                               0.08      0.12      0.10        0.12      0.17      0.14    Secondary                                0.13      0.11      0.10        0.16      0.24      0.12    Combined                                 0.26      0.27      0.42        0.27      0.40      0.28 School size    Less than 150                            0.30      0.22      0.26        0.36      0.43      0.32    150-499                                  0.09      0.14      0.12        0.14      0.19      0.17    500-749                                  0.12      0.21      0.16        0.17      0.29      0.19    750 or more                              0.12      0.16      0.14        0.17      0.18      0.19 Minority enrollment    Less than 20%                            0.07      0.11      0.10        0.11      0.19      0.16    20-50%                                   0.18      0.19      0.19        0.22      0.26      0.25    More than 50%                            0.15      0.22      0.21        0.19      0.22      0.18 Free-lunch recipients    Less than 20%                            0.08      0.12      0.14        0.12      0.23      0.21    20-49%                                   0.10      0.12      0.14        0.16      0.18      0.22    50% or more                              0.17      0.17      0.19        0.21      0.22      0.20 District size    Less than 1,000                          0.16      0.19      0.17        0.24      0.23      0.27    1,000-4,999                              0.12      0.16      0.14        0.17      0.27      0.23    5,000-9,999                              0.20      0.23      0.27        0.27      0.36      0.37    10,000 or more                           0.10      0.17      0.13        0.17      0.18      0.18 Community type    Central city                             0.13      0.19      0.19        0.18      0.23      0.24    Urban fringe/large town                  0.10      0.16      0.16        0.17      0.24      0.22    Rural/small town                         0.10      0.10      0.10        0.15      0.19      0.17 Sex    Male                                     0.06      0.09      0.10        0.10      0.17      0.16    Female                                   0.15      0.16      0.15        0.17      0.16      0.12 Race-ethnicity    American Indian/Alaska Native            0.61      0.63      0.62        0.70      0.80      0.67    Asian/Pacific Islander                   0.82      0.97      1.01        0.78      0.71      0.61    Black non-Hispanic                       0.25      0.28      0.25        0.24      0.32      0.21    White non-Hispanic                       0.06      0.09      0.08        0.09      0.16      0.12    Hispanic                                 0.41      0.57      0.53        0.37      0.47      0.37    Total minority                           0.21      0.25      0.21        0.21      0.26      0.16---------------------------------------------------------------------------------------------------------**Table B16.-Standard errors for Table A16:  Average years of experience in education for public            and private school principals, by selected school and principal characteristics:             1987-88, 1990-91, and 1993-94(continued)**---------------------------------------------------------------------------------------------------------                                                       Professional experience in education                                         ----------------------------------------------------------------                                            Average years as teachers      Average years as principals                                         ------------------------------- --------------------------------School/principal characteristics           1987-88   1990-91   1993-94     1987-88   1990-91   1993-94---------------------------------------------------------------------------------------------------------PRIVATETotal                                        0.23      0.15      0.19        0.18      0.20      0.21 School level    Elementary                               0.25      0.27      0.24        0.23      0.30      0.27    Secondary                                0.66      0.45      0.40        0.57      0.36      0.36    Combined                                 0.46      0.33      0.33        0.31      0.36      0.34 School size    Less than 150                            0.34      0.25      0.32        0.23      0.30      0.36    150-499                                  0.23      0.21      0.23        0.31      0.30      0.21    500-749                                  0.45      0.55      0.38        0.71      0.55      0.41    750 or more                              0.67      0.69      0.41        0.77      0.79      0.40 Minority enrollment    Less than 20%                            0.25      0.22      0.26        0.22      0.24      0.30    20-50%                                   0.65      0.47      0.41        0.59      0.51      0.42    More than 50%                            0.37      0.47      0.46        0.41      0.47      0.41 Sex    Male                                     0.26      0.22      0.21        0.26      0.29      0.26    Female                                   0.26      0.20      0.26        0.21      0.26      0.27 Race-ethnicity    American Indian/Alaska Native            2.51      3.83      2.87        2.60      3.37      2.96    Asian/Pacific Islander                   1.45      1.64      1.45        1.24      2.08      2.86    Black non-Hispanic                       0.97      1.92      0.81        0.72      0.79      1.04    White non-Hispanic                       0.24      0.17      0.18        0.20      0.18      0.22    Hispanic                                 1.30      0.77      0.83        1.26      1.01      1.43    Total minority                           0.69      1.00      0.60        0.64      0.70      0.75---------------------------------------------------------------------------------------------------------          SOURCE:  U.S. Department of Education, National Center for Education Statistics, Schools and Staffing Survey:  1987-88 (School Administrator, Public and Private School, and Teacher Demand and Shortage Questionnaires), 1990-91 (Public and Private School Administrator, Public and Private School, and Teacher Demand and Shortage Questionnaires), and 1993-94 (Public and Private School Principal, Public and Private School, and Teacher Demand and Shortage Questionnaires).