Goldberg s IPIP Big-Five factor markers: Internal consistency and concurrent validation in Scotland

Goldberg s (2001) IPIP Big-Five personality factor markers currently lack validating evidence. The structure of the 50-item IPIP was examined in three different adult samples (total N = 906), in each case justifying a 5-factor solution, with only minor discrepancies. Age differences were comparable to previous findings using other inventories. One sample (N = 207) also completed two further personality measures (the NEO-FFI and the EPQ-R Short Form). Conscientiousness, Extraversion and Emotional Stability/ Neuroticism scales of the IPIP were highly correlated with those of the NEO-FFI (r = 0.69 to 0.83, p < 0.01). Agreeableness and Intellect/Openness scales correlated less strongly (r = 0.49 and 0.59 respectively, p < 0.01). Correlations between IPIP and EPQ-R Extraversion and Emotional Stability/Neuroticism were high, at 0.85 and 0.84 respectively. The IPIP scales have good internal consistency and relate strongly to major dimensions of personality assessed by two leading questionnaires. 2005 Elsevier Ltd. All rights reserved.