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File:Reg ls dgr qq resid t edat pad.svg

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Description
Català: Diagrama q-q dels residuals tipificats d'un model de regressió lineal
Date
Source Own work
Author Pep Roca
 
This W3C-unspecified chart was created with R.

R source code edit 

# Es crea la base de dades amb nombres aleatoris:
set.seed(1)
N         = 100
U         = rnorm(N)
EDAT      = 50 + rnorm(N)
PAD       = 20 + EDAT + U                      # Pressió arterial diastòlica
DADES_RLS = data.frame(PAD, EDAT)              # Es crea la taula de dades

# Regressío linal simple:
PAD_LM = lm(PAD ~ EDAT, data = DADES_RLS)      # S'estima el model de regressió lineal
PAD_LM_RESID_E = rstandard(PAD_LM)             # Es calculen els residu tipificats
svg("gra/reg_ls_dgr_qq_resid_t_edat_pad.svg")  # Desar el diagrama en un fitxer tipus svg
qqnorm(PAD_LM_RESID_E,                         # Crear el diagrama q-q
       ylab="Residus tipificats",              # Etiqueta de l'eix de les y
       xlab="Quantils de la llei normal",      # Etiqueta de l'eix de les x
       main="Diagrama q-q de normalitat")      # Títol del gràfic
qqline(PAD_LM_RESID_E)                         # S'afegeix una línia de referència
dev.off()                                      # Tancar i desar el diagrama

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current16:07, 23 June 2014Thumbnail for version as of 16:07, 23 June 2014630 × 630 (65 KB)Pep Roca (talk | contribs)User created page with UploadWizard

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