R2N: Nagelkerke R^2
In brookiem86/dDIF: MH and LR DIF Detection for Dichotomously Scored Items
Description
Usage
Arguments
Details
Value
References
See Also
Description
R2N produces Nagelkerke’s R^2 estimate for the specified LR
model. Used in the function LRd
Usage
1
R2N(mod, n)
Arguments
mod
an object of class glm
n
the total sample size
Details
The magnitude of DIF is calculated by subtracting the R^2 estimate
of the compact model from the R^2 value of the augmented model.
Several pseudo R^2 estimates are available. The Nagelkerke ?R^2
estimate (Nagelkerke, 1991) is used to compute the DIF effect size for the
LRd function.
Nagelkerke R^2 is estimated using the equations below:
R^2_CS = 1 - (exp(- LL(M_null)/2 + LL(M_obs)/2))^(2/n)
R^2_MAX = 1 - (exp(-LL(M_null)/2))^(2/n)
R^2_CS/R^2_MAX
Value
a numeric value estimating Nagelkerke R^2
References
Nagelkerke, N. J. D. (1991). A note on a general definition of the
coefficient of determination. Biometrika, 78, 691-692.
See Also
LRd for LR DIF
brookiem86/dDIF documentation built on May 13, 2019, 7:50 a.m.
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Description Usage Arguments Details Value References See Also
Description
R2N produces Nagelkerke’s R^2 estimate for the specified LR
model. Used in the function LRd
Usage
1 | R2N(mod, n)
|
Arguments
mod |
an object of class glm |
n |
the total sample size |
Details
The magnitude of DIF is calculated by subtracting the R^2 estimate
of the compact model from the R^2 value of the augmented model.
Several pseudo R^2 estimates are available. The Nagelkerke ?R^2
estimate (Nagelkerke, 1991) is used to compute the DIF effect size for the
LRd function.
Nagelkerke R^2 is estimated using the equations below:
R^2_CS = 1 - (exp(- LL(M_null)/2 + LL(M_obs)/2))^(2/n)
R^2_MAX = 1 - (exp(-LL(M_null)/2))^(2/n)
R^2_CS/R^2_MAX
Value
a numeric value estimating Nagelkerke R^2
References
Nagelkerke, N. J. D. (1991). A note on a general definition of the coefficient of determination. Biometrika, 78, 691-692.
See Also
LRd for LR DIF
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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