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st: ST: mfx output


From   Laura Platchkov <LMP881@bham.ac.uk>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: ST: mfx output
Date   Sat, 19 Sep 2009 13:51:03 +0100

Dear statalist users, 

I was just wondering how to interpret the mfx function, because I fail to find anotated output. In particular, how do I interpret the output when my independent variables is in logarithm form? And:

- Is the "y = fitted values (predict) " the predicted value for the dependent at the mean of the sample? 
-  what does the X stand for?
- how do I do to compute the elasiticites?


 mfx

Marginal effects after regress
      y  = Fitted values (predict)
         =  6.6559795
------------------------------------------------------------------------------
variable |      dy/dx    Std. Err.     z    P>|z|  [    95% C.I.   ]      X
---------+--------------------------------------------------------------------
dtempwin |   .2421058      .24952    0.97   0.332  -.246949   .73116   .050837
dtempspr |   .4376307       .2409    1.82   0.069  -.034528   .90979   .023661
dtempsum |  -.1514247      .89739   -0.17   0.866  -1.91027  1.60742   .024777
dtempfal |  -.6262103      .94935   -0.66   0.509  -2.48691  1.23448   .019205
dpreci~n |  -1.346017      .57004   -2.36   0.018  -2.46327 -.228766  -.899125
dpreci~r |   .9487695      .42794    2.22   0.027   .110019  1.78752  -.116792
dpreci~m |   -.675565      .24334   -2.78   0.006  -1.15251  -.19862   3.35233
dpreci~l |   .5008795      .16544    3.03   0.002   .176633  .825126   4.32255
dtempw~2 |   .0233782      .09772    0.24   0.811  -.168145  .214902   2.35825
dtemp~r2 |   .2214721      .12956    1.71   0.087  -.032469  .475414   3.88076
dtemp~m2 |   .5369094      .39422    1.36   0.173  -.235748  1.30957   3.32566
dtempf~2 |  -.6301785      .59813   -1.05   0.292  -1.80249  .542135   1.22008
dprec~n2 |   .0058086      .00205    2.83   0.005   .001792  .009825   1452.24
dprec~r2 |  -.0038283      .00196   -1.95   0.051  -.007677   .00002   801.534
dprec~m2 |   .0033669      .00113    2.99   0.003   .001158  .005576   7734.41
dprec~l2 |  -.0011596      .00033   -3.53   0.000  -.001803 -.000516   10793.5
   soil1 |  -2.832005     1.72421   -1.64   0.100   -6.2114  .547394   .013659
   soil2 |   41.66267      16.865    2.47   0.013   8.60754  74.7178     .0086
 ln_area |  -.3286273      .05804   -5.66   0.000  -.442382 -.214873    .79798
rec_di~B |  -.4837681      .29385   -1.65   0.100   -1.0597  .092168   .070454
rec_di~Y |   -.990503      .64856   -1.53   0.127  -2.26167  .280661    .05256
------------------------------------------------------------------------------

Thanks a lot, 

Laura 

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