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Re: st: Need help with working across variables
From
Cory Smith <[email protected]>
To
[email protected]
Subject
Re: st: Need help with working across variables
Date
Sun, 10 Feb 2013 00:57:51 -0500
You'll need the "by" command if you have used it before.
Cory
On Sun, Feb 10, 2013 at 12:56 AM, Cory Smith <[email protected]> wrote:
> All non-missing observations will be the same iff the minimum value
> equals the maximum value. You can fill in the rest given the previous
> code, I think.
>
> Cory
>
> On Sun, Feb 10, 2013 at 12:53 AM, Michael Stewart
> <[email protected]> wrote:
>> Dear Cory,
>> This works,
>> Thanks a lot
>> on the same lines have another question
>>
>> id var
>> 1 2
>> 1 2
>> 1 3
>> 1 2
>> 2 1
>> 2 1
>> 2 1
>> 2 .
>> 2 1
>> 3 1
>> 3 2
>> 3 4
>>
>> How do I check of all(nonmissing) observations for a particular id are the same
>> thanks
>> Mike
>>
>> On Sun, Feb 10, 2013 at 12:34 AM, Cory Smith <[email protected]> wrote:
>>> Too complicated in my opinion.
>>>
>>> gen x = 0
>>>
>>> egen Vmin = rowmin(var1 - var4)
>>> egen Vmax = rowmax(var1 - var4)
>>>
>>> replace x = 1 if Vmin == 1 & Vmax == 1 & Vmin != .
>>> replace x = 2 if Vmin == 2 & Vmax == 2 & Vmin != .
>>>
>>> Actually, some of the terms in the above are unnecessary but I kept
>>> them in for clarity.
>>>
>>> On Sun, Feb 10, 2013 at 12:27 AM, Alison Connor <[email protected]> wrote:
>>>> Hi Michael,
>>>>
>>>> There might be a more efficient way to do it, but if you have egenmore
>>>> you can do:
>>>>
>>>> egen x=rall(var1 var2 var3 var4), c(@==1)
>>>>
>>>> This will be 1 if all non-missing variables are 1, and 0 otherwise. If
>>>> you only have two values for your variables, then you can run this
>>>> command again, and then merge the two into a third variable:
>>>>
>>>> egen x1=rall(var1 var2 var3 var4), c(@==1)
>>>> egen x2=rall(var1 var2 var3 var4), c(@==2)
>>>>
>>>> gen x=0
>>>> replace x=1 if x1==1
>>>> replace x=2 if x2==1
>>>>
>>>> If you are going to do this for multiple values, then you can create a loop:
>>>>
>>>> gen x=0
>>>> forvalues i=1/2 {
>>>> egen x`i'=rall(var1 var2 var3 var4), c(@==`i')
>>>> replace x=`i' if x`i'==1
>>>> drop x`i'
>>>> }
>>>>
>>>> ~Alison
>>>>
>>>>
>>>> On Sun, Feb 10, 2013 at 10:41 AM, Michael Stewart
>>>> <[email protected]> wrote:
>>>>>
>>>>> HI ,
>>>>> Here is my data format and my question:
>>>>> id var1 var2 var3 var4
>>>>> 1 1 1 1 .
>>>>> 2 1 1 1 1
>>>>> 3 1 2 1 .
>>>>> 4 2 2 2 2
>>>>> 5 1 1 1 1
>>>>> 6 1 2 . .
>>>>> 7 2 1 2 .
>>>>>
>>>>> I am trying to generate a new variable x =1 if all non missings values
>>>>> for the variables(per observation) are equal to 1 and x =2 if all non
>>>>> missings values for the variables(per observation) are equal to 2. I
>>>>> tried to do foreach loop like
>>>>>
>>>>> gen x=0
>>>>> foreach x in var1 var2 var3 var4{
>>>>> replace x=1 if `x'=1
>>>>> }
>>>>> but it doesnt seem to do the trick
>>>>>
>>>>> I am specifically interested in to change x =1 if all nonmissign
>>>>> values for an observation are equal to one
>>>>> For example: I would like to replace x=1 for id=1 but not for id 3
>>>>> Similarly, I would like to replace x=2 if all nom missing values for
>>>>> an observation are equal to two.
>>>>>
>>>>> --
>>>>> Thank you ,
>>>>> Yours Sincerely,
>>>>> Mike.
>>>>> *
>>>>> * For searches and help try:
>>>>> * http://www.stata.com/help.cgi?search
>>>>> * http://www.stata.com/support/faqs/resources/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/faqs/resources/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/faqs/resources/statalist-faq/
>>> * http://www.ats.ucla.edu/stat/stata/
>>
>>
>>
>> --
>> Thank you ,
>> Yours Sincerely,
>> Mike.
>> *
>> * For searches and help try:
>> * http://www.stata.com/help.cgi?search
>> * http://www.stata.com/support/faqs/resources/statalist-faq/
>> * http://www.ats.ucla.edu/stat/stata/
*
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