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Tema 1.2 Aplicaţii fidelitatea testelor

Aplicatii – fidelitatea testelor - Baza de date SPSS (Scala de evaluare a efectelor psihologice, somatice şi pedagogice – aplicaţie fidelitatea testelor 2.sav) 1. Pentru baza de date folosita la seminarul anterior, calculati toate tipurile de fidelitate pentru intreaga scala, pe care le cunoasteti; -Pentru Alfa Cronbach Case Processing Summary N Cases

Valid Excluded

a

Total

% 111

100.0

0

.0

111

100.0

a. Listwise deletion based on all variables in the procedure. Reliability Statistics Cronbach's Alpha

N of Items .581

15

-Pentru half-split

Reliability Statistics Cronbach's Alpha

Part 1

Value N of Items

Part 2

Value N of Items

Total N of Items Correlation Between Forms Spearman-Brown Coefficient

.763 8a .280 7b 15 .298

Equal Length

.459

Unequal Length

.460

Guttman Split-Half Coefficient

.451

a. The items are: ed01, ed02, ed03, ed04, ed05, ed06, ed07, ed08. b. The items are: ed08, ed09, ed10, ed11, ed12, ed13, ed14, ed15.

-Pentru formele paralele Test for Model Goodness of Fit Chi-Square

Value

Log of Determinant of

2220.342

df

118

Sig

.000

Unconstrained Matrix Constrained Matrix

-12.214 8.979

Under the parallel model assumption

Reliability Statistics Common Variance

1.876

True Variance

.159

Error Variance

1.717

Common Inter-Item

.085

Correlation Reliability of Scale

.581

Reliability of Scale

.588

(Unbiased)

2. Identificati itemii problematici si decideti cum anume pot fi tratati ei pentru a creste consistenta interna a chestionarului. Item Statistics Mean

Std. Deviation

N

ed01

3.16

.823

111

ed02

3.71

.769

111

ed03

2.83

.866

111

ed04

3.45

.716

111

ed05

2.81

.789

111

ed06

3.43

1.434

111

ed07

2.92

.745

111

ed08

4.38

.681

111

ed09

4.41

4.428

111

ed10

3.75

.611

111

ed11

3.30

.530

111

ed12

4.15

.632

111

ed13

3.09

.615

111

ed14

3.81

.528

111

ed15

3.67

.766

111

Item-Total Statistics Corrected Item-

Cronbach's

Scale Mean if

Scale Variance

Total

Alpha if Item

Item Deleted

if Item Deleted

Correlation

Deleted

ed01

49.71

53.185

.630

.521

ed02

49.16

54.789

.532

.536

ed03

50.04

54.246

.504

.533

ed04

49.42

55.346

.523

.539

ed05

50.07

54.491

.542

.533

ed06

49.44

62.836

-.152

.630

ed07

49.95

55.563

.478

.542

ed08

48.49

55.848

.503

.543

ed09

48.46

29.834

.248

.769

ed10

49.13

57.776

.353

.559

ed11

49.57

60.380

.094

.580

ed12

48.73

57.186

.402

.555

ed13

49.78

59.944

.116

.578

ed14

49.06

60.245

.111

.579

ed15

49.20

55.068

.508

.538

-Abaterea standard ne arata ca itemi 6 si 9 sunt problematici, deoarele aceasta este mult mai mare in comparatie cu ceilalti. La itemul 9 un scor a fost introdus gresit, iar la 6 scorarea trebuie facuta invers. 3. Comparati rezultatele obtinute prin diferite metode. Case Processing Summary N

%

Cases

Valid Excluded

a

Total

32

28.8

79

71.2

111

100.0

a. Listwise deletion based on all variables in the procedure.

Reliability Statistics Cronbach's Alpha

N of Items .863

15

4. Calculati Alfa Cronbach pentru urmatoarele subscale: - simptome pedagogice : itemii 1, 2, 3, 4, 5, 7. Case Processing Summary N Cases

Valid Excludeda Total

% 111

100.0

0

.0

111

100.0

a. Listwise deletion based on all variables in the procedure.

Reliability Statistics Cronbach's Alpha

N of Items .883

6

- simptome psihologice: itemii 6, 8, 9, 10, 12, 15. Case Processing Summary N Cases

Valid

% 32

28.8

Excludeda Total

79

71.2

111

100.0

a. Listwise deletion based on all variables in the procedure.

Reliability Statistics Cronbach's Alpha

N of Items .908

6

- simptome somatice : itemii 11, 13, 14. Case Processing Summary N Cases

Valid Excluded

a

Total

% 111

100.0

0

.0

111

100.0

a. Listwise deletion based on all variables in the procedure.

Reliability Statistics Cronbach's Alpha

N of Items .579

3

5. Estimati valoarea consistentei interne daca testul ar avea 30 itemi. 30:15=2 (2x0.86):[1+(2-1)x0.86]=1.72:1.86=0.92 6. Calculati de cati itemi mai este nevoie pentru a creste fidelitatea testului la .90. [0.90(1-0.86)]:[0.86(1-0.90)]=0.126:0.226=0.55

15x0.55=8.25 15+8.25=23.25 =>testul va avea 24 de itemi =>mai e nevoie de 9 itemi 7. Calculati de cati itemi mai este nevoie pentru Scala Simptome somatice a creste fidelitatea testului la .70. [0.70x(1-0.57)]:[0.57x(1-0.70)]=0.30:0.17=1.7 3x1.7=5.1 6+3=9 =>scala va avea nevoie de 9 itemi =>mai e nevoie de 6 itemi 8. Estimati valoarea consistentei interne a Scalei Simptome pedagogice daca aceasta subscala ar avea 10 itemi. 10:6=1.66 (1.66x0.88):[1+(1.66-1)x0.88]=1.46:1.58=0.92 9. Cat ar deveni coeficientul de consistenta Interna Alfa Cronbach daca am reduce Scala Simptome pedagogice la 3 itemi? 3:6=0.5 (0.5x0.88):[1+(0.5-1)x0.86] 0.44:0.57=0.77