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[Caleb Ouma]

Caleb Ouma Ongong'a
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"Remember that happiness doesn't depend on what you are or on what you possess, but only on how you think.">

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[Richard Ristow]

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         -----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of
Caleb Ouma
Sent: 29 August 2007 03:33
To: [hidden email]
Subject: unsubscribe

         Caleb Ouma Ongong'a
         +254721-953790,020 356 2426
         P.O Box 756556-00200
         Nairobi-Kenya.

         Alternative e-mails
         [hidden email]
         [hidden email]

         "Remember that happiness doesn't depend on what you are or on what
you possess, but only on how you think.">

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         Yahoo! Small Business gives you all the tools to get online.

[<R. Abraham>]

I have a slightly different question on randomly assigning a number.

I want to assign a random number between the ranges 19 and 35, if a case
meets a specific criteria.

e.g.
If Inferred Age = '1' and Tenure <19,

Then Assign a Random Number between 19 and 35 for the value of 'Age', such
that there is a difference of atleast 16 years between the values of
'Tenure' and 'Age'.

Note:
Inferred Age '1' = 19-35 years
'Age' Value is Missing

The SAS code for this is:
if InferredAge=1 and Tenure<19 then Age=16*ranuni(0)+19;

Can somebody help with a similar syntax in SPSS?

Thanks.
Renji Abraham

[Richard Ristow]

At 01:52 PM 8/30/2007, Chang,Victor wrote to me, off-list:

>SIGNOFF SPSSX-L


I don't like to nag, but since you're posting this as a reply, you must
have seen the very recent postings about unsubscribing, including a
complete set of the following instructions. There is a great deal to be
said for reading available relevant information.

Anyway, here you go:

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[Richard Ristow]

At 12:22 PM 8/30/2007, <R. Abraham> wrote:

>I want to assign a random number between the ranges 19 and 35, if a
>case
>meets a specific criteria.
>
>e.g.
>If Inferred Age = '1' and Tenure <19,
>
>Then Assign a Random Number between 19 and 35 for the value of 'Age',
>such that there is a difference of atleast 16 years between the values
>of
>'Tenure' and 'Age'.
>
>The SAS code for this is:
>if InferredAge=1 and Tenure<19 then Age=16*ranuni(0)+19;

Well, that translates directly into SPSS; in fact, it can be made the
corresponding SPSS with only a little editing. (In fact, I've made some
changes not strictly necessary.) I don't have a SAS manual right here;
I'm assuming that 'ranuni(0)' returns a number uniform-distributed on
(0,1). This is not tested, but:

if InferredAge EQ 1 and Tenure LT 19
    Age=16*rv.uniform(0,1)+19.

BUT, I think the SAS code may be buggy, with the bugs carried over to
the SPSS code:

- The result won't be an integer, in either SPSS or SAS, if that
matters.

- You say you want "a difference of at least 16 years between the
values of 'Tenure' and 'Age'". You won't get that. This code is
triggered by any value of Tenure less than 19; it can generate a value
as close to 19 as you like. The minimum difference is 0, though that
can never be reached exactly; or 1, if 'Tenure' is always an integer.

AND, are you sure this is a good idea at all? It looks like you may be
filling in reasonable but fictitious values for missing values. At very
best, this loses statistical power; at a likely worst, it can give
results that are plain wrong.

-Good luck and onward,
  Richard