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md2
2017 Jul 16
0
How to formulate quadratic function with interaction terms for the PLS fitting model?
...must be a matrix, or poly(NIR,...) will fail.
2) Due to the previously identified bug in poly, degree must be
explicitly given as poly(NIR, degree =2,raw = TRUE).
Now consider the following example:
> df <-matrix(runif(60),ncol=3)
> y <- runif(20)
> mdl1 <-lm(y~df*I(df^2))
> mdl2 <-lm(y~df*poly(df,degree=2,raw=TRUE))
> length(coef(mdl1))
[1] 16
> length(coef(mdl2))
[1] 40
Explanation:
In mdl1, I(df^2) gives the squared values of the 3 columns of df. The
formula df*I(df^2) gives the 3 (linear) terms of df, the 3 pure
quadratics of I(df^2), the 9 cubic terms obtaine...
2017 Jul 16
2
How to formulate quadratic function with interaction terms for the PLS fitting model?
> On Jul 13, 2017, at 7:43 AM, Bert Gunter <bgunter.4567 at gmail.com> wrote:
>
> Below.
>
> -- Bert
> Bert Gunter
>
>
>
> On Thu, Jul 13, 2017 at 3:07 AM, Luigi Biagini <luigi.biagini at gmail.com> wrote:
>> I have two ideas about it.
>>
>> 1-
>> i) Entering variables in quadratic form is done with the command I
>>
2010 Apr 14
0
total. factor. prodctvty. help!!
...es on it, such as "eco" and "RD" and i want to use
panel-data techniques in order to get the effect of eco and RD net of
unobserved heterogeneity.
so the theortically the model that i want to estimate is
TFPit=alpha0+alpha1(eco)+alpha2(RD)+Ui+Vt+Wit
so i run this command;
>mdl2<-plm(resid~eco+RD, data=newdata)
then there is an error
Error in model.frame.default(formula = resid ~ eco + RD, data = ds,
drop.unused.levels = TRUE) :
variable lengths differ (found for 'eco')
well here in fact, probably i am doing a econometrical mistake that might be
quite easy f...