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Analyse statistique avancée

Analyse statistique avancée

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[one answer] What does a logistic regression predict, and how do we judge it?

Any value, judged with an R².

A probability between zero and one, judged on how well it classifies.

100%

A score with no unit, judged by the size of its coefficients.

A certain yes-or-no answer, judged by the number of mistakes.

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[one answer] What does "the coefficient is significant" mean?

The observed gap is too marked to be easily explained by sampling chance.

100%

The link found is a cause-and-effect link.

The measured effect is large in practice.

The model explains most of the variability.

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[one answer] What have you understood about a residual?

The difference between two successive predictions.

The measurement error of the instrument.

The vertical gap between what was observed and what the line predicted.

100%

The shortest distance between the point and the line.

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[one answer] Why does an adjusted R² exist?

Because the plain R² does not work with more than two variables.

Because the plain R² can become negative.

Because the R² must be corrected when the sample is small.

Because the plain R² always rises when a variable is added, even a useless one.

100%

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[one answer] How do we read a coefficient in multiple regression?

As the total effect of that variable, all causes together.

As the relative importance of the variable, coefficients being comparable with each other.

As the effect of that variable when the other variables in the model stay the same.

100%

As the share of variability that this variable explains on its own.

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