Extract coefficients from a matrix

[Dario Maimone Ansaldo Patti]

Dear all,

I estimate a model using the user-written command xtdpdqml. Then I stored the estimated coefficients within a matrix object:

. mat list bx

bx[1,56]
        _model:     _model:     _model:     _model:     _model:     _model:
            LD.          D.          D.          D.          D.          D.
    investment        cash       cash2         mtb     eflocal  cs_eflocal
y1   .43629807   .00364227   .02832072   .00336012   .00547717    -.007783

        _model:     _model:     _model:     _model:     _model:     _model:
             D.          D.          D.          D.          D.          D.
         time2       time3       time4       time5       time6       time7
y1   .01091878   .00735329   .00882722   .01316997   .01304237   .01639875

        _model:     _model:     _model:     _model:     _model:     _model:
             D.          D.          D.          D.          D.          D.
         time8       time9      time10      time11      time12      time13
y1   .01628743   .01894632   .00367786    .0142553   .02099019   .01901806

        _model:     _model:     _model:     _model:     _model:     _model:
             D.          D.          D.          D.          D.          D.
        time14      time15      time16      time17      time18      time19
y1   .01472434   .01633638   .01335646   .00845851   .01146143    .0138188

        _model:   _initobs:   _initobs:   _initobs:   _initobs:   _initobs:
             D.          D.         FD.          D.         FD.          D.
        time20        cash        cash       cash2       cash2         mtb
y1    .0086074   .00164603  -.04897719   .01524066  -.00358587   .00102967

      _initobs:   _initobs:   _initobs:   _initobs:   _initobs:   _initobs:
            FD.          D.         FD.          D.         FD.          D.
           mtb     eflocal     eflocal  cs_eflocal  cs_eflocal       time2
y1  -.00057571   .00324671   .00191596  -.00575118   .00862258  -.00065353

      _initobs:   _initobs:   _initobs:   _initobs:   _initobs:   _initobs:
             D.          D.          D.          D.          D.          D.
         time3       time4       time5       time6       time7       time8
y1  -.00089422  -.00064182   .00525141    .0083503   .01099966   .01135225

      _initobs:   _initobs:   _initobs:   _initobs:   _initobs:   _initobs:
             D.          D.          D.          D.          D.          D.
         time9      time10      time11      time12      time13      time14
y1   .01294235    .0025812   .00548301   .00867464   .02117244    .0159787

      _initobs:   _initobs:   _initobs:   _initobs:   _initobs:   _initobs:
             D.          D.          D.          D.          D.            
        time15      time16      time17      time18      time19       _cons
y1   .01896074   .00993922   .00168838   .01026795   .00904553   -.0005388

      _sigma2e:     _omega:
                           
         _cons       _cons
y1   .00075504   1.6351193

I need to extract from the above matrix same specific coefficients, specifically those indicates as _model:D.cash and _model:D.cash2. I tried the following:

mat b1=beta[1,_b[_model:D.cash]]

but the result is:

mat list b1

symmetric b1[1,1]
    c1
r1   .

Do you have any hint about how to extract those coefficients?

Thanks in advace.

Dario

[Andrew Musau]

help matrix extraction

Your matrix is named "bx", so to extract an element from it:

mat b1= bx[1, "_model:D.cash"]

or just referencing the row and column:

mat b1= bx[1, 2]

[Dario Maimone Ansaldo Patti]

Andrew Musau Thanks Andrew. You are right....I made confusion with the name of the matrix. Thanks a lot.