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Analiza de covarianta- ANCOVA

NC

Natalia Curmei

Transcript

Analiza de covarianta- ANCOVA

Step 5

Step 4

Gradele de libertate

ANCOVA

Gradele de libertate associate (fiecare variabilaă

de control suplimentar aduce la pierderea unui grad de libertate):

• Variatia interna: n-c-1;

• Variatia externa: c-1;

• valoare pozitiva, ceea ce indicaă o legatura directa;

• valoare negativa, ceea ce indica o legatura inversa;

• valoare zero, daca variabilele sunt independente.

Planul de cercetare

1. variabile independente;

2. variabile dependente;

3. variabile confundate.

caracterul aleator;

posibilitatea replicarii;

controlul variabilelor confundate;

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