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Re: st: R: variable not found?


From   Joerg Luedicke <joerg.luedicke@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: R: variable not found?
Date   Mon, 24 Oct 2011 16:57:05 -0400

How about this:

test 1.group

J.

On Mon, Oct 24, 2011 at 4:53 PM, Paul Burkander <paul@burkander.com> wrote:
> The use of -test- in this case is not unnecessary, and if it's
> incorrect I'd rather you tell me why.  Please see
> http://www.ats.ucla.edu/stat/stata/dae/mvreg.htm for an explanation of
> the usefulness of the joint test across equations.  This exercise
> follows the example on that page almost exactly.
>
> Also please note that this question has nothing to do with the
> substance of the homework, but with what still appears to be a bug in
> stata. I should also note that the homework has been handed in, so no
> advice given here will affect it.
>
> Exactly what I did: using emacs, I replaced the spaces with commas.
> then in stata:
>
> insheet using filename
> manova motive aspire algebra geom =group
> mvreg
> test group
>
> Which gave the error "group not found."  Below is the log.
>
> What exactly did you type that didn't result in error?
>
> Thank you.
> Paul
>
> . insheet using data.csv
> (5 vars, 221 obs)
>
> . des
>
> Contains data
>  obs:           221
>  vars:             5
>  size:         4,641 (99.9% of memory free)
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>              storage  display     value
> variable name   type   format      label      variable label
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> motiv           float  %9.0g                  MOTIV
> aspire          float  %9.0g                  ASPIRE
> algebra         float  %9.0g                  ALGEBRA
> geom            float  %9.0g                  GEOM
> group           byte   %8.0g                  GROUP
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> Sorted by:
>     Note:  dataset has changed since last saved
>
> . manova motiv aspire algebra geom = group
>
>                           Number of obs =     221
>
>                           W = Wilks' lambda      L = Lawley-Hotelling trace
>                           P = Pillai's trace     R = Roy's largest root
>
>                  Source |  Statistic     df   F(df1,    df2) =   F   Prob>F
>              -----------+--------------------------------------------------
>                   group | W   0.9056      1     4.0   216.0     5.63 0.0002 e
>                         | P   0.0944            4.0   216.0     5.63 0.0002 e
>                         | L   0.1043            4.0   216.0     5.63 0.0002 e
>                         | R   0.1043            4.0   216.0     5.63 0.0002 e
>                         |--------------------------------------------------
>                Residual |               219
>              -----------+--------------------------------------------------
>                   Total |               220
>              --------------------------------------------------------------
>                           e = exact, a = approximate, u = upper bound on F
>
> . mvreg
>
> Equation          Obs  Parms        RMSE    "R-sq"          F        P
> ----------------------------------------------------------------------
> motiv             221      2    17.81392    0.0384   8.740918   0.0035
> aspire            221      2    14.48455    0.0920   22.19203   0.0000
> algebra           221      2    17.94691    0.0318    7.20056   0.0078
> geom              221      2    14.22695    0.0615   14.34351   0.0002
>
> ------------------------------------------------------------------------------
>             |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
> -------------+----------------------------------------------------------------
> motiv        |
>     1.group |   7.413426   2.507497     2.96   0.003     2.471512    12.35534
>       _cons |   42.30231    2.01703    20.97   0.000     38.32703    46.27758
> -------------+----------------------------------------------------------------
> aspire       |
>     1.group |   9.604709   2.038852     4.71   0.000     5.586426    13.62299
>       _cons |   62.79179   1.640052    38.29   0.000     59.55949     66.0241
> -------------+----------------------------------------------------------------
> algebra      |
>     1.group |   6.778811   2.526216     2.68   0.008     1.800006    11.75762
>       _cons |   45.65538   2.032087    22.47   0.000     41.65043    49.66033
> -------------+----------------------------------------------------------------
> geom         |
>     1.group |   7.584382   2.002592     3.79   0.000     3.637563     11.5312
>       _cons |   66.57667   1.610884    41.33   0.000     63.40185    69.75149
> ------------------------------------------------------------------------------
>
> . test group
> group not found
> r(111);
>
>
> On Mon, Oct 24, 2011 at 2:16 PM, Steven Samuels <sjsamuels@gmail.com> wrote:
>>
>> Sorry, my reply was incomplete.  I get no error message with -test- -mvreg- after pasting your data into BBEdit, replacing commas with spaces, and making all names lower case. You haven't actually shown us, as the FAQ request, exactly what you typed.
>>
>>
>> Steve
>>
>>
>> Paul,
>>
>>
>>
>> Your use of the -test- statement appears to be incorrect, and unnecessary too.  The output  of -manova- do give the (four) tests that all groups have zero coefficiernts
>>
>> You must test four coefficients, not one, if you want a global test of group differences.
>> I'd also remind the group that the FAQ suggest we don't respond to requests for help with homework.
>>
>>
>> Steve
>>
>>
>> On Oct 24, 2011, at 4:14 PM, Paul Burkander wrote:
>>
>> In my attempt at brevity, I didn't note that the variables are turned
>> to lowercase when pasted, and we were running the command with the
>> correct case.  And the error is actually "regressor group not found"
>> My apologies for the erroneous description.
>>
>> This seems like a bug.  It's replicated in stata 12.
>>
>> On Mon, Oct 24, 2011 at 6:01 AM, Nick Cox <n.j.cox@durham.ac.uk> wrote:
>>> Whatever the problem is, that will not solve it.
>>>
>>> -format- changes display format only; it doesn't otherwise change the status of any variable, especially its kind, type or storage characteristics.
>>>
>>> Nick
>>> n.j.cox@durham.ac.uk
>>>
>>> Christian Otchia
>>>
>>> You should format the variable after pasting in Stata 11.
>>>
>>> Try this:
>>>
>>> format %6.1g GROUP
>>>
>>> test GROUP
>>>
>>>
>>> Paul Burkander
>>>
>>>> I'm trying to help my wife do some stata homework, and we've run into
>>>> some odd behavior.
>>>>
>>>> Below is a sample of the data.  She's supposed to do a manova of
>>>> MOTIV,ASPIRE,ALGEBRA,GEOM, on GROUP , then mvreg, then test the
>>>> restriction that the coefficients on GROUP are zero in all four
>>>> equations.  After doing the manova and mvreg, we typed test GROUP, but
>>>> receive the error message "GROUP not found."
>>>>
>>>> Any ideas?  Perhaps we're doing something dumb?  She entered the data
>>>> by pasting into the data editor.  We're using Stata 11 SE and I just
>>>> did a full update.
>>>>
>>>> Thanks, Paul
>>>>
>>>> MOTIV,ASPIRE,ALGEBRA,GEOM,GROUP
>>>> 74.31,78.57,68.59,78.57,1
>>>> 27.15,61.91,37.15,71.43,1
>>>> 64.31,90.48,67.16,83.34,1
>>>> 40.01,64.29,48.59,59.53,1
>>>> 35.73,59.53,31.44,54.76,1
>>>> 55.73,83.34,60.02,85.72,0
>>>> 52.87,64.29,62.88,69.05,0
>>>> 58.59,71.43,64.31,80.95,0
>>>
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>>>
>>
>> *
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>>
>>
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>>
>
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>

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