[R] a question on lda{MASS}

[Weiwei Shi]

hi,

maybe I should re-phrase my question a bit:

is there a way to get explicit formulae like Y ~ sum of CiXi from the
model build by lda{MASS} to calculate $x (value) ?

I assume scaling is the coeff and Xi is from test data and Y is $x
called LD1. But I want to confirm this.

Thanks.

Weiwei

On 8/9/07, Weiwei Shi <helprhelp at gmail.com> wrote:
> hi,
>
> assume
> val is the test data while m is lda model value by using CV=F
>
> x = predict(m, val)
>
> val2 = val[, 1:(ncol(val)-1)] # the last column is class label
>
> # col is sample, row is variable
>
> then I am wondering if
>
> x$x == (apply(val2*m$scaling), 2, sum)
>
> i.e., the scaling (is it coeff vector?) times val data and sum is the
> discrimant result $x?
>
> Thanks.
>
> --
> Weiwei Shi, Ph.D
> Research Scientist
> GeneGO, Inc.
>
> "Did you always know?"
> "No, I did not. But I believed..."
> ---Matrix III
>


-- 
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.

"Did you always know?"
"No, I did not. But I believed..."
---Matrix III