[R] about lm()

[Bert Gunter]

Ted:

Yes. You're probably right, and I'm probably wrong. I did not read
carefully enough. Impossible to know for sure with such an ill-posed
query, though.

Cheers,
Bert

Bert Gunter
Genentech Nonclinical Biostatistics
(650) 467-7374

"Data is not information. Information is not knowledge. And knowledge
is certainly not wisdom."
H. Gilbert Welch




On Sun, Mar 30, 2014 at 2:12 PM, Ted Harding <Ted.Harding at wlandres.net> wrote:
> I suspect the problem may be with the structure of the data.
>
> Si Qi L wrote:
>   [...]
>   acc1<- lm(data$acc ~ dummy + data$Reqloanamount + data$Code +
>   data$Code.1 + data$EmpNetMonthlyPay + data$Customer_Age + data$RTI)
>   [...]
>   These attributes are all numerical except the "acc"(factors)
>   [...]
>
> If, as he implies, the "acc" variable in "data" is a factor,
> then lm() will not enjoy fitting an lm where the dependent
> variables (response) is a factor!
>
> Just a shot in the dark ...
> Ted.
>
> On 30-Mar-2014 18:46:27 Bert Gunter wrote:
>> 1. Post in plain text, not HTML.
>>
>> 2. Read ?lm and note the data argument. Use it in your lm call instead
>> of all the xxxx$data extractions.
>>
>> 3. Your problem is with the summary() call, so read ?summary.lm. Learn
>> about S3 methods if you do not know where the ".lm" part is coming
>> from by reading the "Introduction to R " tutorial that ships with R,
>> which you should have read already anyway.
>>
>> Cheers,
>> Bert
>>
>> Bert Gunter
>> Genentech Nonclinical Biostatistics
>> (650) 467-7374
>>
>> "Data is not information. Information is not knowledge. And knowledge
>> is certainly not wisdom."
>> H. Gilbert Welch
>>
>>
>>
>>
>> On Sun, Mar 30, 2014 at 9:43 AM, Frank Schwidom <schwidom at gmx.net> wrote:
>>> Please provide some data from your variable data.
>>>
>>> Show the output of dput( data) or an subset
>>> of data which leads toe the specific error.
>>>
>>> Regards
>>>
>>>
>>> On Sun, Mar 30, 2014 at 02:23:09PM +0100, Si Qi L. wrote:
>>>> Hi
>>>>
>>>> I have a problem with linear regression. This is my codes:
>>>>
>>>> acc1<- lm(data$acc ~ dummy + data$Reqloanamount + data$Code + data$Code.1 +
>>>> data$EmpNetMonthlyPay + data$Customer_Age + data$RTI)
>>>> summary(acc1)
>>>>
>>>> These attributes are all numerical except the "acc"(factors), so how can I
>>>> fix the problem R showed me? can anyone please help me out? Many thanks!
>>>>
>>>> But the R shows:
>>>>
>>>> Residuals:Error in quantile.default(resid) : factors are not allowedIn
>>>> addition: Warning message:In Ops.factor(r, 2) : ^ not meaningful for
>>>> factors
>>>>
>>>>       [[alternative HTML version deleted]]
>>>>
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>>>
>>> ______________________________________________
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>>
>> ______________________________________________
>> R-help at r-project.org mailing list
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>
> -------------------------------------------------
> E-Mail: (Ted Harding) <Ted.Harding at wlandres.net>
> Date: 30-Mar-2014  Time: 21:12:16
> This message was sent by XFMail
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.