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| library(PISA2012lite) | |
| pol <- student2012[student2012$CNT == 'Poland',] | |
| model <- lm(cbind(PV1MATH, PV1READ, PV1SCIE)~ST28Q01+ST04Q01, pol) | |
| # jeżeli nie jest zainstalowany to | |
| # install.packages("heplots") | |
| library(heplots) | |
| heplot(model, size="effect.size", las=1, term.labels=FALSE) |
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