Thanks all so much for your help! I went out for 2 days vacation and could
not reply your guys email. Yes, the CV=False works.

Thanks again!




On Sun, Jul 4, 2010 at 2:47 AM, Peter Ehlers <ehlers@ucalgary.ca> wrote:

> On 2010-07-03 21:33, Changbin Du wrote:
>
>> HI, Dear community,
>>
>> I am using the linear discriminant analysis to build model and make new
>> predictions:
>>
>>  dim(train)  #training data
>>>
>> [1] 1272   22
>>
>>> dim(valid)  # validation data
>>>
>> [1] 140  22
>>
>>
>> lda.fit<- lda(out ~ ., data=train, na.action="na.omit", CV=TRUE) # model
>> fitting of linear discriminant analysis on training data
>>
>>  predict(lda.fit, valid)   # make prediction on validation data
>>>
>> Error in UseMethod("predict") :
>>   no applicable method for 'predict' applied to an object of class "list"
>>
>> Can anyone help with this?
>>
>
> Suggestions:
>
> 0. lda() is not a function in the base installation of R;
>   I'll assume that you mean MASS::lda.
>
> 1. ask yourself what you expect from setting CV = TRUE.
>
> 2. *carefully* (re)read the help pages for lda (especially
>   the Value section) and for predict.lda (the 'object'
>   definition).
>
> 3. use CV = FALSE
>
> 4. whenever problems arise, *first* use str() on your
>   objects to see what you've got.
>
> 5. finally, do provide *reproducible* code; here, you
>   could have used the example on the help page.
>
>  -Peter Ehlers
>
>
>> Thanks so much!
>>
>>


-- 
Sincerely,
Changbin
--

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