以下是某个回归结果：

. qreg price weight length foreign
  Iteration  1:  WLS sum of weighted deviations =  112795.66

  Iteration  1: sum of abs. weighted deviations =     111901
  Iteration  2: sum of abs. weighted deviations =  110529.43
  Iteration  3: sum of abs. weighted deviations =  109524.57
  Iteration  4: sum of abs. weighted deviations =   109468.3
  Iteration  5: sum of abs. weighted deviations =  109105.27
  note:  alternate solutions exist
  Iteration  6: sum of abs. weighted deviations =  108931.02
  Iteration  7: sum of abs. weighted deviations =   108887.4
  Iteration  8: sum of abs. weighted deviations =  108822.59

  Median regression                                    Number of obs =        74
    Raw sum of deviations   142205 (about 4934)
    Min sum of deviations 108822.6                     Pseudo R2     =    0.2347

  ------------------------------------------------------------------------------
         price |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
  -------------+----------------------------------------------------------------
        weight |   3.933588   .8602183     4.57   0.000     2.217937    5.649239
        length |  -41.25191    28.8693    -1.43   0.157    -98.82991    16.32609
       foreign |   3377.771   577.3391     5.85   0.000     2226.305    4529.237
         _cons |   344.6494   3260.244     0.11   0.916    -6157.702    6847.001


请问以下这些项都分别表示什么啊？？？求帮助！！！求大神解答！！
  Iteration  1:  WLS sum of weighted deviations =  112795.66

  Iteration  1: sum of abs. weighted deviations =     111901
  Iteration  2: sum of abs. weighted deviations =  110529.43
  Iteration  3: sum of abs. weighted deviations =  109524.57
  Iteration  4: sum of abs. weighted deviations =   109468.3
  Iteration  5: sum of abs. weighted deviations =  109105.27
  note:  alternate solutions exist
  Iteration  6: sum of abs. weighted deviations =  108931.02
  Iteration  7: sum of abs. weighted deviations =   108887.4
  Iteration  8: sum of abs. weighted deviations =  108822.59

Number of obs =        74
Raw sum of deviations   142205 (about 4934)
Min sum of deviations 108822.6                    
Pseudo R2     =    0.2347
  ------------------------------------------------------------------------------