101 lines
2.7 KiB
Plaintext
101 lines
2.7 KiB
Plaintext
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R Under development (unstable) (2019-01-23 r76006) -- "Unsuffered Consequences"
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Copyright (C) 2019 The R Foundation for Statistical Computing
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Platform: x86_64-pc-linux-gnu (64-bit)
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R is free software and comes with ABSOLUTELY NO WARRANTY.
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You are welcome to redistribute it under certain conditions.
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Type 'license()' or 'licence()' for distribution details.
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R is a collaborative project with many contributors.
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Type 'contributors()' for more information and
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'citation()' on how to cite R or R packages in publications.
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Type 'demo()' for some demos, 'help()' for on-line help, or
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'help.start()' for an HTML browser interface to help.
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Type 'q()' to quit R.
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> options(na.action=na.exclude) # preserve missings
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> options(contrasts=c('contr.treatment', 'contr.poly')) #ensure constrast type
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> library(survival)
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>
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> #
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> # Test out the t-distribution
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> #
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> # First, a t-dist with 500 df should be nearly identical to the Gaussian
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>
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> fitig <- survreg(Surv(time, status)~voltage,
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+ dist = "gaussian", data = capacitor)
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> fit1 <- survreg(Surv(time, status) ~ voltage,
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+ dist='t', parms=500, capacitor)
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> fitig
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Call:
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survreg(formula = Surv(time, status) ~ voltage, data = capacitor,
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dist = "gaussian")
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Coefficients:
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(Intercept) voltage
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1917.431558 -4.087366
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Scale= 314.4748
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Loglik(model)= -249.2 Loglik(intercept only)= -258.7
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Chisq= 18.97 on 1 degrees of freedom, p= 1.32e-05
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n= 64
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> summary(fit1, corr=F)
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Call:
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survreg(formula = Surv(time, status) ~ voltage, data = capacitor,
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dist = "t", parms = 500)
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Value Std. Error z p
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(Intercept) 1918.329 219.536 8.74 < 2e-16
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voltage -4.091 0.778 -5.26 1.5e-07
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Log(scale) 5.749 0.133 43.12 < 2e-16
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Scale= 314
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Student-t distribution: parmameters= 500
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Loglik(model)= -249.2 Loglik(intercept only)= -258.7
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Chisq= 19.01 on 1 degrees of freedom, p= 1.3e-05
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Number of Newton-Raphson Iterations: 5
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n= 64
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>
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> # A more realistic fit
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> fit2 <- survreg(Surv(time, status) ~ voltage,
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+ dist='t', parms=5, capacitor)
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> print(fit2)
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Call:
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survreg(formula = Surv(time, status) ~ voltage, data = capacitor,
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dist = "t", parms = 5)
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Coefficients:
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(Intercept) voltage
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1975.155951 -4.315492
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Scale= 276.799
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Loglik(model)= -250.2 Loglik(intercept only)= -261
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Chisq= 21.65 on 1 degrees of freedom, p= 3.27e-06
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n= 64
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>
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> if (FALSE) {
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+ resid(fit2, type='response')
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+ resid(fit2, type='deviance')
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+ resid(fit2, type='working')
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+ resid(fit2, type='dfbeta')
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+ resid(fit2, type='dfbetas')
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+ resid(fit2, type='ldresp')
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+ resid(fit2, type='ldshape')
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+ resid(fit2, type='ldcase')
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+ resid(fit2, type='matrix')
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+
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+ predict(fit2, type='link')
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+ predict(fit2, type='terms')
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+ predict(fit2, type='quantile')
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+ }
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>
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> proc.time()
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user system elapsed
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0.752 0.028 0.782
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