I tried to read over below article but don't understand, anybody shade me a light?
UNDERSTANDING 3-WAY INTERACTIONS BETWEEN CONTINUOUS VARIABLES
R LME4 mixed models with nesting and nesting-interactions
Above question asked about nested interaction model, I do appreciate if somebody shade me a light.
your first post is ideas on how to graph fitted models of a certain type.
your second post is about how to construct a particular model.
I think you would have higher likelihood of being supported here, if you ask a very specific question. Try to be clear on whether you have an R question, or a statistics question...
General requests to be supported in understanding large open-ended topics are unlikely to be successful in garnering help.
Result <- lmer(Y ~ X*Z*W+(1|PPX)+I(X*Z*W)^2+I(X*Z*W)^3,data=Matrix)
From bove example, I don't know how to interpret above model?
How to calculate X value, Z value and W value in R?
You should study the lmer formula syntax
https://benwhalley.github.io/just-enough-r/fitting-models.html
Your second question doesn't make sense so I can't answer it the way you asked it. You should be aware that X Z W are symbols representing the variables containing training data for the model to be fit on
Result <- lm(Y ~ X * Z * W, data = Matrix)
How to interpret above model, calculate X value and Z value and W value in R?
if you repeat yourself I also can repeat myself. but its not a very fun game....
in a normal lm()
the * syntax means to have the variable and also its interaction with the other variable in the model
so X*Z is equivalent to X + Z + X:Z
X and Z and W values are not something that one would calculate ....
Update model : 3-way interaction terms not dropped there is an example for 3-way interaction terms with polynomial models, may I know how to interpret it?
you want to understand a model on data you dont know over a modelling context you dont know, and also the model is incorrect as it was based on a users syntax error ?
I'm sorry but I won't touch this.
https://stats.stackexchange.com/a/373259/68357 is an example, I kust wonder if I have lm()...
Below is another example
>> x <- lm(mpg ~ cyl * disp * hp * drat, mtcars)
>> summary(x)
>
> Call:
> lm(formula = mpg ~ cyl * disp * hp * drat, data = mtcars)
>
> Residuals:
> Min 1Q Median 3Q Max
> -3.5725 -0.6603 0.0108 1.1017 2.6956
>
> Coefficients:
> Estimate Std. Error t value Pr(>|t|)
> (Intercept) 1.070e+03 3.856e+02 2.776 0.01350 *
> cyl -2.084e+02 7.196e+01 -2.896 0.01052 *
> disp -6.760e+00 3.700e+00 -1.827 0.08642 .
> hp -9.302e+00 3.295e+00 -2.823 0.01225 *
> drat -2.824e+02 1.073e+02 -2.633 0.01809 *
> cyl:disp 1.065e+00 5.034e-01 2.116 0.05038 .
> cyl:hp 1.587e+00 5.296e-01 2.996 0.00855 **
> disp:hp 7.422e-02 3.461e-02 2.145 0.04769 *
> cyl:drat 5.652e+01 2.036e+01 2.776 0.01350 *
> disp:drat 1.824e+00 1.011e+00 1.805 0.08990 .
> hp:drat 2.600e+00 9.226e-01 2.819 0.01236 *
> cyl:disp:hp -1.050e-02 4.518e-03 -2.323 0.03368 *
> cyl:disp:drat -2.884e-01 1.392e-01 -2.071 0.05484 .
> cyl:hp:drat -4.428e-01 1.504e-01 -2.945 0.00950 **
> disp:hp:drat -2.070e-02 9.568e-03 -2.163 0.04600 *
> cyl:disp:hp:drat 2.923e-03 1.254e-03 2.331 0.03317 *
> ---
> Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
>
> Residual standard error: 2.245 on 16 degrees of freedom
> Multiple R-squared: 0.9284, Adjusted R-squared: 0.8612
> F-statistic: 13.83 on 15 and 16 DF, p-value: 2.007e-06
Source : https://stat.ethz.ch/pipermail/r-help/2013-April/351761.html
mpg is y, may I know below calculation if correct?
-
cyl= cyl -
disp= disp + cyl:disph + cyl:disp:hp + cyl:disp:drat + cyl:disp:hp:drat -
hp= hp + cyl:hp + cyl:disp:hp +disp:hp:drat + cyl:disp:hp:drat -
drat= drat + hp:drat + cyl:disp:drat + disp:hp:drat + cyl:disp:hp:drat
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