Medir recursos: correlações e confiabilidade
Análise Fatorial em R
Jennifer Brussow
Psychometrician
Correlações
lowerCor(gcbs)
lowerCor(gcbs)
Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 ...
Q1 1.00
Q2 0.53 1.00
Q3 0.36 0.40 1.00
Q4 0.52 0.53 0.50 1.00
Q5 0.48 0.46 0.40 0.57 1.00
Q6 0.63 0.55 0.40 0.61 0.50 1.00
Q7 0.47 0.67 0.42 0.57 0.45 0.54 1.00
Q8 0.39 0.38 0.78 0.49 0.41 0.41 0.41 1.00
Q9 0.42 0.49 0.49 0.56 0.46 0.48 0.53 0.48 1.00
Q10 0.44 0.38 0.32 0.40 0.43 0.41 0.39 0.36 0.37 1.00
...
Testando a significância das correlações: p-values
corr.test(gcbs, use = "pairwise.complete.obs")$p
Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 Q12 Q13 Q14 Q15
Q1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Q2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Q3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Q4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Q5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
...
Q11 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Q12 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Q13 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Q14 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Q15 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Testando a significância das correlações: intervalos de confiança
corr.test(gcbs, use = "pairwise.complete.obs")$ci
lower r upper p
Q1-Q2 0.4970162 0.5259992 0.5538098 0
Q1-Q3 0.3206223 0.3553928 0.3892067 0
Q1-Q4 0.4953852 0.5244323 0.5523079 0
Q1-Q5 0.4503342 0.4810747 0.5106759 0
...
Q1-Q11 0.6199265 0.6435136 0.6659388 0
Q1-Q12 0.4932727 0.5224025 0.5503620 0
Q1-Q13 0.3464313 0.3805006 0.4135673 0
Q1-Q14 0.5059498 0.5345780 0.5620298 0
Q1-Q15 0.4753633 0.5051815 0.5338405 0
...
Coeficiente alfa
alpha(gcbs)
Reliability analysis
Call: alpha(x = gcbs)
raw_alpha std.alpha G6(smc) average_r S/N ase mean sd
0.93 0.93 0.94 0.48 14 0.002 2.9 1
lower alpha upper 95% confidence boundaries
0.93 0.93 0.94
Coeficiente alfa
alpha(gcbs)
Reliability if an item is dropped:
raw_alpha std.alpha G6(smc) average_r S/N alpha se
Q1 0.93 0.93 0.94 0.48 13 0.0021
Q2 0.93 0.93 0.94 0.48 13 0.0021
Q3 0.93 0.93 0.94 0.49 13 0.0020
Q4 0.93 0.93 0.94 0.47 13 0.0022
Q5 0.93 0.93 0.94 0.48 13 0.0021
...
Q11 0.93 0.93 0.94 0.48 13 0.0021
Q12 0.93 0.93 0.94 0.47 13 0.0022
Q13 0.93 0.93 0.94 0.48 13 0.0021
Q14 0.93 0.93 0.94 0.48 13 0.0021
Q15 0.93 0.93 0.94 0.49 14 0.0020
Confiabilidade Split-Half
splitHalf(gcbs)
Split half reliabilities
Call: splitHalf(r = gcbs)
Maximum split half reliability (lambda 4) = 0.95
Guttman lambda 6 = 0.94
Average split half reliability = 0.93
Guttman lambda 3 (alpha) = 0.93
Minimum split half reliability (beta) = 0.86
Vamos praticar!
Análise Fatorial em R
