請問怎麼解釋交互作用變項不顯著 但是他們的marginal effects顯著? 謝謝! Random-effects GLS regression Number of obs = 1,360 Group variable: id1 Number of groups = 172 R-sq: Obs per group: within = 0.1152 min = 2 between = 0.1123 avg = 7.9 overall = 0.1308 max = 10 Wald chi2(12) = 76.82 corr(u_i, X) = 0 (assumed) Prob > chi2 = 0.0000 (Std. Err. adjusted for 172 clusters in id1) ------------------------------------------------------------------------------- | Robust asp_pct | Coef. Std. Err. z P>|z| [95% Conf. Interval] --------------+---------------------------------------------------------------- mp | -1.332043 .5194244 -2.56 0.010 -2.350096 -.3139898 mp_sqr | .1547854 .043082 3.59 0.000 .0703462 .2392245 coh2 | 14.89091 5.379513 2.77 0.006 4.347255 25.43456 coh3 | 22.1159 5.544094 3.99 0.000 11.24967 32.98212 fqhc | 12.39198 4.62368 2.68 0.007 3.329734 21.45423 system | 20.40573 4.582832 4.45 0.000 11.42355 29.38792 interv | 4.570367 1.425087 3.21 0.001 1.777247 7.363487 maint | 1.091151 .7326216 1.49 0.136 -.3447612 2.527063 interv_fqhc | -5.622486 3.999668 -1.41 0.160 -13.46169 2.216719 maint_fqhc | -1.76751 1.225599 -1.44 0.149 -4.16964 .6346198 interv_system | -5.573831 1.594597 -3.50 0.000 -8.699185 -2.448477 maint_system | .9807776 .8697199 1.13 0.259 -.723842 2.685397 _cons | 37.42812 5.35765 6.99 0.000 26.92732 47.92892 --------------+---------------------------------------------------------------- sigma_u | 24.31059 sigma_e | 5.9862898 rho | .94283128 (fraction of variance due to u_i) ------------------------------------------------------------------------------- . margins, at(maint = (0 1) fqhc = (0 1) system = (0 1)) Predictive margins Number of obs = 1,360 Model VCE : Robust Expression : Linear prediction, predict() 1._at : fqhc = 0 system = 0 maint = 0 2._at : fqhc = 0 system = 0 maint = 1 3._at : fqhc = 0 system = 1 maint = 0 4._at : fqhc = 0 system = 1 maint = 1 5._at : fqhc = 1 system = 0 maint = 0 6._at : fqhc = 1 system = 0 maint = 1 7._at : fqhc = 1 system = 1 maint = 0 8._at : fqhc = 1 system = 1 maint = 1 ------------------------------------------------------------------------------ | Delta-method | Margin Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- _at | 1 | 49.37554 3.573883 13.82 0.000 42.37085 56.38022 2 | 50.46669 3.521219 14.33 0.000 43.56522 57.36815 3 | 69.78127 2.973859 23.46 0.000 63.95261 75.60993 4 | 70.87242 3.003034 23.60 0.000 64.98658 76.75826 5 | 61.76751 3.08916 19.99 0.000 55.71287 67.82216 6 | 62.85867 3.068848 20.48 0.000 56.84383 68.8735 7 | 82.17325 5.309122 15.48 0.000 71.76756 92.57894 8 | 83.2644 5.348805 15.57 0.000 72.78093 93.74786 ------------------------------------------------------------------------------ fqhc, system and one more variable are coded as dummy variables. --

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