Displaying 4 results from an estimated 4 matches for "nir_sq".

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2017 Jul 13

3

How to formulate quadratic function with interaction terms for the PLS fitting model?

I have two ideas about it.
1-
i) Entering variables in quadratic form is done with the command I
(variable ^ 2) -
plsr (octane ~ NIR + I (nir ^ 2), ncomp = 10, data = gasTrain, validation =
"LOO"
You could also use a new variable NIR_sq <- (NIR) ^ 2
ii) To insert a square variable, use syntax I (x ^ 2) - it is very
important to insert I before the parentheses.
iii) If you want to make the interaction between x and x ^ 2 use the
command ":" -> x: I(x ^ 2)
iv) For multiple interactions between x and x ^ 2 use the...

2017 Jul 13

0

How to formulate quadratic function with interaction terms for the PLS fitting model?

...mail.com> wrote:
> I have two ideas about it.
>
> 1-
> i) Entering variables in quadratic form is done with the command I
> (variable ^ 2) -
> plsr (octane ~ NIR + I (nir ^ 2), ncomp = 10, data = gasTrain, validation =
> "LOO"
> You could also use a new variable NIR_sq <- (NIR) ^ 2
>
> ii) To insert a square variable, use syntax I (x ^ 2) - it is very
> important to insert I before the parentheses.
True, but better I believe: see ?poly.
e.g. poly(cbind(x1,x2,x3), degree = 2, raw = TRUE) is a full quadratic
polynomial in x1,x2,x3 .
>
> iii) If...

2017 Jul 16

2

How to formulate quadratic function with interaction terms for the PLS fitting model?

...ve two ideas about it.
>>
>> 1-
>> i) Entering variables in quadratic form is done with the command I
>> (variable ^ 2) -
>> plsr (octane ~ NIR + I (nir ^ 2), ncomp = 10, data = gasTrain, validation =
>> "LOO"
>> You could also use a new variable NIR_sq <- (NIR) ^ 2
>>
>> ii) To insert a square variable, use syntax I (x ^ 2) - it is very
>> important to insert I before the parentheses.
>
> True, but better I believe: see ?poly.
> e.g. poly(cbind(x1,x2,x3), degree = 2, raw = TRUE) is a full quadratic
> polynomial...

2017 Jul 16

0

How to formulate quadratic function with interaction terms for the PLS fitting model?

...>>
>>> 1-
>>> i) Entering variables in quadratic form is done with the command I
>>> (variable ^ 2) -
>>> plsr (octane ~ NIR + I (nir ^ 2), ncomp = 10, data = gasTrain, validation =
>>> "LOO"
>>> You could also use a new variable NIR_sq <- (NIR) ^ 2
>>>
>>> ii) To insert a square variable, use syntax I (x ^ 2) - it is very
>>> important to insert I before the parentheses.
>>
>> True, but better I believe: see ?poly.
>> e.g. poly(cbind(x1,x2,x3), degree = 2, raw = TRUE) is a full quad...