Reading 6 The Behavioral Biases of Individuals Flashcards
cognitive errors definition
- Cognitive errors - biases based on faulty cognitive reasoning.
- Cognitive errors stem from basic statistical, information-processing, or memory errors.
- Cognitive errors are more easily corrected than emotional biases.
- Individuals are less likely to make cognitive errors if they remain vigilant to the possibility of their occurrence.
- Ways to reduce the cognitive errors:
- gather, record, and synthesize information
- document decisions and the reasoning behind them
- compare the actual outcomes with expected results
- systematic process to describe problems and objectives
emotional biases definition
- Emotional biases - biases based on reasoning influenced by feelings or emotions.
- Emotional biases stem from impulse or intuition.
- Because emotional biases stem from impulse or intuition—especially personal and sometimes unreasoned judgments—they are less easily corrected.
- In the case of emotional biases, it may only be possible to recognize the bias and adapt to it rather than correct for it.
- Ways to work with emotional biases:
- When possible, focusing on cognitive aspects of the biases may be more effective than trying to alter an emotional response.
- Also, educating about the investment decision-making process and portfolio theory can be helpful in moving the decision making from an emotional basis to a cognitive basis.
- When biases are emotional in nature, drawing these to the attention of an individual making the decision is unlikely to lead to positive outcomes; the individual is likely to become defensive rather than receptive to considering alternatives. Thinking of the appropriate questions to ask to potentially alter the decision-making process is likely to be most effective.
two categories of cognitive errors
- Belief perseverance is the tendency to cling to one’s previously held beliefs irrationally or illogically.
The belief perseverance biases discussed are conservatism, confirmation, representativeness, illusion of control, and hindsight (5).
- Processing errors, describing how information may be processed and used illogically or irrationally in financial decision making.
The processing errors discussed are anchoring and adjustment, mental accounting, framing, and availability (4).
cognitive dissonance
Cognitive dissonance is the mental discomfort that occurs when new information conflicts with previously held beliefs or cognitions.
- Conservatism Bias
Conservatism bias is a belief perseverance bias in which people maintain their prior views or forecasts by inadequately incorporating new information (in Bayesian term people overweight the base rates& underreact to new information).
This bias has aspects of both statistical and information-processing errors.
Consequences of Conservatism Bias:
As a result of conservatism bias, FMPs may do the following:
- Maintain or be slow to update a view or a forecast, even when presented with new information
- Opt to maintain a prior belief rather than deal with the mental stress of updating beliefs given complex data
Detection of and Guidance for Overcoming Conservatism Bias
- The effect of conservatism bias may be corrected for or reduced by properly analyzing and weighting new information.
- seek professional advise
- Confirmation bias
Confirmation bias is a belief perseverance bias in which people tend to look for and notice what confirms their beliefs, and to ignore or undervalue what contradicts their beliefs. This behavior demonstrates a selection bias.
Consequences of Confirmation Bias
In the investment world, confirmation bias is exhibited repeatedly. As a result of confirmation bias, FMPs may do the following:
- Consider only the positive information about an existing investment and ignore any negative information about the investment.
- Develop screening criteria incorrectly to find what they want to see.
- Under-diversify portfolios, leading to excessive exposure to risk.
- Hold a disproportionate amount of their investment assets in their employing company’s stock because they believe in their company and are convinced of its favorable prospects.
Detection of and Guidance for Overcoming Confirmation Bias
- The effect of confirmation bias may be corrected for or reduced by actively seeking out information that challenges your beliefs.
- Another useful step is to get corroborating support for an investment decision
- Do additional research
- Representativeness bias
Representativeness bias is a belief perseverance bias in which people tend to classify new information based on past experiences and classifications (in Bayesian terms investors tend to underweight the base rates&overweight new information). They believe their classifications are appropriate and place undue weight on them.
Base-rate neglect and sample-size neglect are two types of representativeness bias that apply to FMPs.
In base-rate neglect, new information is given too much importance, taken to represent too much, and underlying probabilities are not sufficiently considered (too little weight to the base rate).
In sample-size neglect, FMPs incorrectly assume that small sample sizes are representative of populations (or “real” data).
Consequences of Representativeness Bias
FMPs often overweight new information and small samples because they view the information or sample as representative of the population as a whole. As a result of representativeness bias, FMPs may do the following:
- Adopt a view or a forecast based almost exclusively on new information or a small sample.
- Update beliefs using simple classifications rather than deal with the mental stress of updating beliefs given complex data.
Detection of and Guidance on Overcoming Representativeness Bias
- FMPs need to be aware of statistical mistakes they may be making and constantly ask themselves if they are overlooking the reality of the investment situation being considered.
- In evaluation the performance of a portfolio (or a fund) this would include analyzing: How the performance compares to similiar portfolios? Have there been changes in the managers of the portolio? What is the general reputation of the manager? Has the portfolio or manager changed style or investment approach due to changing conditions?
- When FMPs sense that base-rate or sample-size neglect may be a problem, they should ask the following question: “What is the probability that X (the investment under consideration) belongs to Group A (the group it resembles or is considered representative of) versus Group B (the group it is statistically more likely to belong to)?”
- Illusion of control bias
Illusion of control bias is a bias in which people tend to believe that they can control or influence outcomes when, in fact, they cannot.
Consequences of Illusion of Control
As a result of illusion of control bias, FMPs may do the following:
- Trade more than is prudent.
- Lead investors to inadequately diversify portfolios.
Detection of and Guidelines for Overcoming Illusion of Control Bias
- investors need to recognize that successful investing is a probabilistic activity (even the most powerful investors have little control over the outcomes of the investments they make).
- it is advisable to seek contrary viewpoints
- it is critical to keep records
- Hindsight Bias
Hindsight Bias is a bias when people may see past events as having been predictable and reasonable to expect.
Consequences of Hindsight Bias
As a result of hindsight bias, FMPs may do the following:
- Overestimate the degree to which they predicted an investment outcome, thus giving them a false sense of confidence.
- Cause FMPs to unfairly assess money manager or security performance.
Detection of and Guidelines for Overcoming Hindsight Bias
- Once understood, hindsight bias should be recognizable. FMPs need to be aware of the possibility of hindsight bias and ask such questions as, “Am I re-writing history or being honest with myself about the mistakes I made?”
- To guard against hindsight bias, FMPs need to carefully record and examine their investment decisions, both good and bad, to avoid repeating past investment mistakes.
Information-processing biases
Information-processing biases result in information being processed and used illogically or irrationally.
- Anchoring and adjustment bias
Anchoring and adjustment bias is an information-processing bias in which the use of a psychological heuristic influences the way people estimate probabilities.
This bias is closely related to the conservatism bias.
Consequences of Anchoring and Adjustment Bias
As a result of anchoring and adjustment bias, FMPs may stick too closely to their original estimates when new information is learned.
Detection of and Guidelines for Overcoming Anchoring and Adjustment Bias
- The primary action FMPs can take is to consciously ask questions that may reveal an anchoring and adjustment bias.
- It is important to remember that past prices, market levels, and reputation provide little information about an investment’s future potential and thus should not influence buy-and-sell decisions to any great extent.
- Mental accounting bias
Mental accounting bias is an information-processing bias in which people treat one sum of money differently from another equal-sized sum based on which mental account the money is assigned to.
Consequences of Mental Accounting Bias
A potentially serious problem that mental accounting creates is the placement of investments into discrete “buckets” without regard for the correlations among these assets.
As a result of mental accounting bias, FMPs may do the following:
- Neglect opportunities to reduce risk by combining assets with low correlations.
- Irrationally distinguish between returns derived from income and those derived from capital appreciation.
Detection of and Guidelines for Overcoming Mental Accounting Bias
- An effective way to detect and overcome mental accounting behavior is to recognize the drawbacks of engaging in this behavior. The primary drawback is that correlations between investments are not taken into account when creating an overall portfolio.
- With regard to the income versus total return issue, an effective way to manage the tendency of some FMPs to treat investment income and capital appreciation differently is to focus on total return.
Mental accounting bias can have either of the following forms (or both):
- Based on the source of wealth
- Based on the way people invest
- Framing bias
Framing bias is an information-processing bias in which a person answers a question differently based on the way in which it is asked (framed).
Narrow framing occurs when people lose sight of the big picture and focus on one or two specific points.
Consequences of Framing Bias
FMPs’ willingness to accept risk can be influenced by how situations are presented or framed.
As a result of framing bias, FMPs may do the following:
- Misidentify risk tolerances because of how questions about risk tolerance were framed;
- Choose suboptimal investments, even with properly identified risk tolerances, based on how information about the specific investments is framed.
- Focus on short-term price fluctuations, which may result in excessive trading.
Detection of and Guidelines for Overcoming Framing Bias
- Framing bias is detected by asking such questions as, “Is my decision based on realizing a gain or a loss?”
- Regarding susceptibility to the positive and negative presentation of information, investors should try to be as neutral and open-minded as possible when interpreting investment-related situations.
- Availability bias
Availability bias starts with putting undue empasis on the information that is readily availiable.
There are various (4) sources of availability bias:
- Retrievability. If an answer or idea comes to mind more quickly than another answer or idea, the first answer or idea will likely be chosen as correct even if it is not the reality.
- Categorization. When solving problems, people gather information from what they perceive as relevant search sets.
- Narrow Range of Experience. This bias occurs when a person with a narrow range of experience uses too narrow a frame of reference based upon that experience when making an estimate.
- Resonance. People are often biased by how closely a situation parallels their own personal situation.
Consequences of Availability Bias
As a result of availability bias, FMPs may do the following:
- Choose an investment, investment adviser, or mutual fund based on advertising rather than on a thorough analysis of the options.
- Limit their investment opportunity set.
- Fail to diversify.
- Fail to achieve an appropriate asset allocation.
- Availability bias causes investors to overreact to market conditions, whether positive or negative
Detection of and Guidelines for Overcoming Availability Bias
- To overcome availability bias, investors need to develop an appropriate IPS, carefully research and analyze investment decisions before making them, and focus on long-term results.
- Questions such as “where did I hear of this idea?” could help to detect availiability bias
myopic loss aversion
Myopic loss aversion refers to a situation where FMPs overemphasize the short term potential losses that can occur on stocks and underemphasize the long term return.
This results in a risk premium on stocks that is too high given their long term characteristics and an under-weighting in stocks.