Personality and Individual Differences: Psychological Measurement 4
Self and Observer Reports
This section delves into self and observer reports on personality inventory scales, emphasizing the insights gained from combining these approaches to understand personality measurement's complexity.
Combining Self and Observer Reports
We obtain self-reports from target individuals who complete questionnaires like the Big Five Inventory. Simultaneously, observers also complete the same inventory, describing the target person. High agreement between self and observer reports generally supports construct validity.
Example: The Five Factor Inventory shows correlations of approximately 0.6 between self-reports and spouse observer reports, and around 0.4 to 0.5 with other observers. This indicates substantial positive correlations between self-descriptions and descriptions by others, reinforcing the validity of these questionnaires. Spouses often show higher correlations (e.g., 0.6) compared to friends or neighbors (e.g., 0.4), suggesting those who know you better provide more aligned assessments.
The HEXACO-PIR, a six-factor questionnaire, similarly shows correlations between 0.4 and 0.6 among college students. Such convergence between self and observer reports demonstrates the scale's convergent validity, indicating that it effectively measures traits like extraversion.
Addressing Potential Inaccuracies
Agreement between self and observer reports might arise from shared inaccurate opinions rather than objective truth. To differentiate between these possibilities, compare observer reports from multiple, unacquainted observers from varied contexts. Observers who know each other well may share the same biases, leading to inaccurate descriptions of the target person's personality.
Ostander & Fander Study
This study examined agreement on Big Five personality traits (neuroticism, extraversion, openness, conscientiousness, agreeableness) among targets, parents, college friends, and hometown friends.
Findings: High agreement was observed between self-reports and reports from parents (correlations ranging from 0.34 to 0.5) and college friends (correlations ranging from 0.34 to 0.53). Hometown friends showed somewhat lower agreement.
Averaging these correlations revealed that college friends know targets nearly as well as parents, while hometown friends' knowledge is comparatively less accurate. This suggests that friends from home may not know the individual as well post-college.
Fund et al. Study
This research focused on inter-observer agreement, assessing the extent to which observers agree among themselves about the target person's personality. Six different samples were used, including parents and college friends, parents and hometown friends, college and hometown friends, pairs of college friends, pairs of parents, and pairs of hometown friends.
Key Insight: Observers from different contexts (e.g., parents and college friends) agreed less about the target's personality compared to those from the same context (e.g., two college friends). This suggests that shared contexts lead to shared biases in judgements.
Correlations were generally higher among observers from the same context across the Big Five traits. This underscores the context-dependent nature of observer assessments.
Who Knows You Best?
The accuracy of self and observer reports depends on factors such as how well observers know the target, their closeness, the contexts they share, and their agreement across these contexts. The question remains whether individuals know themselves better than others do.
Some argue that individuals possess superior self-knowledge due to access to internal states and experiences across all situations. However, biases and information overload can hinder accurate self-assessment. Others, viewing the individual from an external perspective, may provide more objective assessments.
Kola et al. Study
This study indicated that peers sometimes predict behaviors better than self-reports. By combining self-reports with observer reports of both the target and another person, researchers predicted behaviors such as social withdrawal or displays of dominance.
Findings: Observer reports occasionally outperformed self-reports in predicting behavior. This suggests potential gaps in self-knowledge, biases, or attempts at self-presentation.
Individuals with conditions like depression may exhibit negative biases, leading them to underreport positive behaviors. Combining self and observer reports yielded the most accurate predictions.
Both self and observer reports possess validity in predicting behavior, with observer reports being slightly more effective, especially when combined. This challenges the notion that self-reports are always superior.
Introducing the SOKA Model
The Self-Other Knowledge Asymmetry (SOKA) model addresses when and why others might predict behavior better than oneself. The model posits that the accuracy of self and observer reports depends on the type of traits considered.
Key Idea: Self and observer reports capture different facets of personality, with accuracy varying by trait type.
Observability: Traits are classified by observability, distinguishing between internal traits (thoughts, feelings) and external traits (overt behaviors). Internal traits, such as anxieties or self-esteem, are less easily observed than external traits like extroversion.
Evaluativeness: Traits are also evaluated based on their evaluativeness, reflecting the degree of social desirability or undesirability assigned to them. Traits like laziness hold high evaluativeness due to their negative connotations, potentially leading to biases in self-reporting.
SOKA Model Predictions
Observability and evaluativeness determine whether self or observer reports are more accurate in predicting behavior. High evaluative traits, for instance, are more prone to biases in self-reports due to social desirability concerns.
Analysis of Varied Trait Types Based on Observability and Evaluativeness
Low Observability, Low Evaluativeness (e.g., Anxious): Self-reports tend to be more accurate than friend reports in this quadrant, as personal feelings are better known to the individual.
High Observability, Low Evaluativeness (e.g., Talkative/Extroversion): Friends or observers are more accurate than self-reports. As those traits are readily apparent, external observation is advantageous.
Low Observability, High Evaluativeness (e.g., Intelligence): Friends are much more accurate than self-reports, as individuals may find it challenging to evaluate themselves without bias.
Conclusions from SOKA Model Data
The model demonstrates the impact of observability and evaluativeness. Self-reports better predict traits with low observability and low evaluativeness, while observer reports are superior for traits with high evaluativeness.
General Conclusions
Self and observer reports typically show considerable agreement, indicating that people generally provide accurate descriptions of their own and others' personalities. Both types of reports can predict behavior with moderate validity, particularly when behaviors are aggregated. However, these reports capture different facets of personality, with varying accuracy depending on the specific traits.
Limitations: Biases such as social desirability and self-deceptive positivity can affect self reports. Observer reports are also prone to bias, such as parents positively overestimating aspects of their children. The more sources of information are aggregated, especially across different traits and characteristics, the more accurate the overall assessment and the more reliable the predictions become.
Understanding how self and observer reports offer unique perspectives on personality traits is essential. The SOKA model elucidates these differences, while considering the context in which observer reports are made. Overall, observability and evaluativeness critically influence the accuracy of self versus observer reports.