[Limdep Nlogit List] Nlogit and calculating choice probabilities

[James Tang]

Thanks, Prof Greene for quick reply.

The output that I get is below.
I'm I correct to interpret --- 

the percentage of mode_0 is the average of the mean of all 259 observations. (0.228+0.236)/2 x100 

or would it be the chose A mode_0 +chose B mode_0 = (0.252+0.242)/2 x100?


NLOGIT
    ;lhs = choice, cset, altij
    ;choices =A, B
	;describe
    ;model:
    U(A) = MODE_0*MODE_0 + MODE_1*MODE_1 + MODE_2*MODE_2 + freq_0*FREQ_0 + freq_1*FREQ_1 + freq_2*FREQ_2 +cost*COST + share_0*SHARE_0 + share_1*SHARE_1/
    U(B) = MODE_0*MODE_0 + MODE_1*MODE_1 + MODE_2*MODE_2 + freq_0*FREQ_0 + freq_1*FREQ_1 + freq_2*FREQ_2 +cost*COST + share_0*SHARE_0 + share_1*SHARE_1$



+-------------------------------------------------------------------------+
|             Descriptive Statistics for Alternative A                    |
|     Utility Function          | (CBS wt = 1.00000) |    131.0 observs.  |
|     Coefficient               | All      259.0 obs.|that chose A        |
| Name          Value  Variable | Mean      Std. Dev.|Mean      Std. Dev. |
| -------------------  -------- | -------------------+------------------- |
| MODE_0        .0149  MODE_0   |     .228       .420|     .252      .436 |
| MODE_1       -.3864  MODE_1   |     .255       .437|     .267      .444 |
| MODE_2        .4979  MODE_2   |     .282       .451|     .275      .448 |
| FREQ_0       -.3217  FREQ_0   |     .282       .451|     .313      .465 |
| FREQ_1       -.2259  FREQ_1   |     .232       .423|     .229      .422 |
| FREQ_2       -.3758  FREQ_2   |     .232       .423|     .206      .406 |
| COST         -.1906  COST     |    4.938      3.189|    3.565     2.810 |
| SHARE_0       .6877  SHARE_0  |     .309       .463|     .359      .481 |
| SHARE_1       .5938  SHARE_1  |     .367       .483|     .466      .501 |
+-------------------------------------------------------------------------+
+-------------------------------------------------------------------------+
|             Descriptive Statistics for Alternative B                    |
|     Utility Function          | (CBS wt = 1.00000) |    128.0 observs.  |
|     Coefficient               | All      259.0 obs.|that chose B        |
| Name          Value  Variable | Mean      Std. Dev.|Mean      Std. Dev. |
| -------------------  -------- | -------------------+------------------- |
| MODE_0        .0149  MODE_0   |     .236       .425|     .242      .430 |
| MODE_1       -.3864  MODE_1   |     .251       .434|     .195      .398 |
| MODE_2        .4979  MODE_2   |     .232       .423|     .289      .455 |
| FREQ_0       -.3217  FREQ_0   |     .216       .412|     .227      .420 |
| FREQ_1       -.2259  FREQ_1   |     .255       .437|     .273      .447 |
| FREQ_2       -.3758  FREQ_2   |     .278       .449|     .188      .392 |
| COST         -.1906  COST     |    4.969      3.208|    3.563     2.783 |
| SHARE_0       .6877  SHARE_0  |     .344       .476|     .375      .486 |
| SHARE_1       .5938  SHARE_1  |     .317       .466|     .375      .486 |
+-------------------------------------------------------------------------+






________________________________________
From: Limdep <limdep-bounces at mailman.sydney.edu.au> on behalf of William Greene via Limdep <limdep at mailman.sydney.edu.au>
Sent: Friday, 28 May 2021 02:00
To: Limdep and Nlogit Mailing List
Cc: William Greene
Subject: Re: [Limdep Nlogit List] Nlogit and calculating choice probabilities

James.  Just fit your MNL model and add ;Describe to the command.
This should get you what you are looking for.
/B. Greene

On Thu, May 27, 2021 at 12:44 AM James Tang via Limdep <
limdep at mailman.sydney.edu.au> wrote:

> Dear Nlogit expert,
>
> I have been using Nlogit for MNL model and 2 way interactions for a model
> building about preferences.
>
> I wanted to know how I can get percentages of a choice of a specific
> attribute's level.
>
> For example,
>
> attribute
> mode of screen (4 levels)
> frequency of screen (4 levels)
> cost (3 levels)
> sharing information (3 levels)
>
> I wanted to know how many participants (percentage) picked a specific mode
> of screen (i.e. percentages of each of the 4 levels).
>
> How would I code this in nlogit coding?
>
> Thank you
>
> James?
>
> ?
>
>
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>

--
William Greene
Department of Economics, emeritus
Stern School of Business, New York University
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New York, NY, 10012
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