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Re: st: list x matrix
From
richard boylan <[email protected]>
To
[email protected]
Subject
Re: st: list x matrix
Date
Sat, 27 Mar 2010 15:56:31 -0500
I had thought of doing that, but was wondering if there was a more
direct way of doing that.
So, I guess that answer the question, one cannot do this without
converting the data into matrix and then back into variable.
On Sat, Mar 27, 2010 at 3:35 PM, Scott Merryman
<[email protected]> wrote:
> You could use -mkmat- to convert the x variables to matrix, perform
> the multiplication and then use -svmat- to create the variables from
> matrix.
>
> For example:
>
>
> . sysuse auto,clear
> (1978 Automobile Data)
>
> . matrix b = 10, 2, -3
> . mkmat mpg price, mat(X)
> . count
> 74
> . mat X = J(r(N),1,1), X
> . matrix z = X*b'
> . svmat z
>
>
> Scott
>
> On Sat, Mar 27, 2010 at 2:49 PM, richard boylan <[email protected]> wrote:
>> Very simple question, but I couldn't find the answer in the STATA documentation.
>>
>> I have a list
>> local var "x1 x2 x3 ...."
>>
>> and a 1 x n matrix (vector)
>>
>> b = (b1 b2 b3 ..)
>>
>> How do I compute the new variable
>>
>> z = b1*x1 + b2*x2 + b3*x3 + ...
>>
>> I mean I know how to do that by writing the sum, there just has to be
>> a better way of doing this.
>>
>> Also, what it is the best place to figure out this stuff?
>>
>> Thanks.
>>
>> Richard
>> *
>> * For searches and help try:
>> * http://www.stata.com/help.cgi?search
>> * http://www.stata.com/support/statalist/faq
>> * http://www.ats.ucla.edu/stat/stata/
>>
>
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
*
* For searches and help try:
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* http://www.ats.ucla.edu/stat/stata/