Presentation: “Causal Conclusions”. Homework Analogies – pp. 81-90 Review: – Exercises...
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Transcript of Presentation: “Causal Conclusions”. Homework Analogies – pp. 81-90 Review: – Exercises...
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Presentation: “Causal Conclusions”
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Homework
• Analogies– pp. 81-90
• Review:– Exercises (models for exam)• Analogical Reasoning, e.g., ex. 8.4• Causal Argumentation, e.g., 8.3b• Inductive Generalization, e.g., 8.2b
No need to write out argument in argument form.
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Identify the (i) sample, (ii) population, and (iii) target characteristic in this generalization.
At a recent Star Wars convention, where more than 3,000 people participated, 50 people under 50 years of age were polled on which they liked better, Star Wars, or Lord of the Rings. 60% said they preferred Star Wars, 20% said they enjoyed both equally, and 20% said they preferred Lord of the Rings. From this survey, we can conclude that more than 50% of all science fiction fans prefer Star Wars to Lord of the Rings.
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At a recent Star Wars convention, where more than 3,000 people participated, 50 people under 50 years of age were polled on which they liked better, Star Wars, or Lord of the Rings. 60% said they preferred Star Wars, 20% said they enjoyed both equally, and 20% said they preferred Lord of the Rings. From this survey, we can conclude that more than 50% of science fiction fans prefer Star Wars to Lord of the Rings.
Strong or Weak? (1a) Sample size?(1b) Statistical representation
of different strata?
(2) Interviewer Bias?
(1) Biased Sample?
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CAUSAL STATEMENTSConcept of Causation
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Causal Statements
How Blackwater Sniper Fire Felled 3 Iraqi GuardsLast Feb. 7, a sniper employed by Blackwater USA, the
private security company, opened fire from the roof of the Iraqi Justice Ministry…. (Three guards were killed.)
An Iraqi police report described the shootings as "an act of terrorism" and said Blackwater "caused the incident." The media network concluded that the guards were killed "without any provocation."
Washington Post, 11/8/2007
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Causal Statements
How Blackwater Sniper Fire Felled 3 Iraqi GuardsLast Feb. 7, a sniper employed by Blackwater USA, the
private security company, opened fire from the roof of the Iraqi Justice Ministry…. (Three guards were killed.)
An Iraqi police report described the shootings as "an act of terrorism" and said Blackwater "caused the incident." The media network concluded that the guards were killed "without any provocation."
Washington Post, 11/8/2007(1) Blackwater (A) caused the incident(2) The guards were killed (B) without provocation• The guards suffered some effect, i.e., not the cause.
Active Voice
Passive Voice
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THE MEANING OF “TO CAUSE SOMETHING”
Causation
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Meaning of Causation
A. Causal Conditions– A Sufficient Condition– A Necessary Condition– Necessary and Sufficient Conditions
B. Partial Causation– Contributing factors
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A. Causal Conditions
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A. Causal Conditions• The Sufficient Condition– The presence of this condition alone is capable of
bringing about the effect
– Sufficient but not necessary condition
– Examples: • The intense heat caused a third degree burn. • If you run over a nail, your tire will burst.
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A. Causal Conditions• The Necessary Condition– The presence of this condition must exist for effect
to occur at all
– Necessary but not sufficient• The presence of a necessary condition does not entail
the causal event will take place
– Examples: • Without oxygen, the fuel cannot be ignited. • If you want to do well on the exam, then you must
study consistently.
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• Necessary AND Sufficient Conditions
P <-> Q
• The biconditional – “if and only if” (iff)– A certain condition, itself, is capable of bringing about the
effectand
– Another condition must exist for first condition to occur at all
A. Causal Conditions
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A. Causal Conditions
• Examples from the text– (Boyle’s Law)
The volume and pressure of a gas are inversely proportional
• If the volume of the gas decreases, then the pressure increases
AND• If the pressure of the gas increases, then the volume
decreases.
The volume of gas decreases if and only if gas pressure increases, and vice versa.
Sufficient & Necessary
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Causal Arguments
1. What are causal statements?
2. Causation: what does this mean?
3. Types of Causal Arguments
4. Critique of Causal Conclusions (Mill’s Methods)– strong causal conclusions– weak causal conclusions
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Causal Arguments
• 4 Types
– Causal statements expressed in premises
1. Causal Predictions2. Causal Explanations3. Causal Prescriptions
– Otherwise
4. Causal Conclusions
Each contains a causal generalization as premise
8.3C, p. 66-68
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Causal Arguments
• Causal Conclusions– Premises• Data expresses relation between events
– Conclusion• Establishes that relation is causal
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MILL’S METHODSCausal Conclusions
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Mill’s Methods
1. Method of:1. Agreement2. Difference• Agreement & Difference
3. Concomitant Variation4. Residue
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Mill’s Method: Agreement• Agreement (p. 71)– If more than one
instance of some phenomenon has only one common antecedent, it is probable that this one antecedent is the cause or partial cause.
• Structural Features– the effect occurs in a
number of cases
– a variety of possible causal factors are present• Only one antecedent
present in each case
“modified method of agreement” (p. 73)1. A plurality of antecedent causal factors is
present in each case(Partial causal factors)
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Mill’s Method: Agreement• Agreement (p. 71)– If two or more instances
of a phenomena E have only one antecedent circumstance in common, then probably that antecedent is the cause or partial cause of E.• E = effect• “argument form” (p. 72)
• Structural Features– the effect occurs in a
number of cases– In each case there are a
variety of possible causal factors• Only one antecedent
causal factor is present in each case
– “modified method of agreement” (p. 73)• A plurality of antecedent
causal factors is present in each case– Partial causal factors
More instances of agreement
the greater the likelihood that this factor is the cause of E.
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Mill’s Method: Difference• Difference (p. 73)– If phenomenon E occurs
and then does not occur when the latter circumstance differs only in the absence of one antecedent, then that absent antecedent circumstance is probably the cause or partial cause of E.
• Structural Features– A minimum of two
happenings• E occurs• E does not occur
– In each case there are a variety of possible causal factors• When E does not occur,
one antecedent factor is removed
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Mill’s Method: Difference• Difference (p. 73)
– If an instance of a phenomena E and an instance in which E does not occur differ only in the absence of one antecedent circumstance with the instance of E, then that antecedent circumstance is probably the cause or partial cause of E. • See “argument form” on p.
73
• Structural Features– A minimum of two
happenings• E occurs• E does not occur
– In each case there are a variety of possible causal factors• When E does not occur,
one antecedent factor is removed
More instances difference
the greater the likelihood that this factor is the cause of E.
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2 of Mill’s Methods
• Agreement– Event (E) occurs
whenever antecedent occurs
• Difference–Absence of event
(E) coincides with absence of causal factor
A causal conclusion is strong to the degree that it is supported by premises with evidence of one or
more of Mill’s methods (p. 79)
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Mill’s Methods: Example
• Six people eat dinner in a restaurant. Liz has soup, a hamburger, ice cream, french fries, and mixed vegetables. Tom has salad, soup, fish, mixed vegetables, and ice cream. Andy has salad, a hamburger, french fries, and ice cream. Sue has french fries, a hamburger, and salad. Meg has fish and mixed vegetables. Bill has french fries, a hamburger, and soup. Later, Liz, Tom, and Andy get sick from something they ate, but Sue, Meg, and Bill don’t. What food made the first three diners sick?– Method of Agreement and Difference
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Mill’s Methods: Example
• Six people eat dinner in a restaurant. Liz has soup, a hamburger, ice cream, french fries, and mixed vegetables. Tom has salad, soup, fish, mixed vegetables, and ice cream. Andy has salad, a hamburger, french fries, and ice cream. Sue has french fries, a hamburger, and salad. Meg has fish and mixed vegetables. Bill has french fries, a hamburger, and soup. Later, Liz, Tom, and Andy get sick from something they ate, but Sue, Meg, and Bill don’t. What food made the first three diners sick?– Method of Agreement and Difference
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Mill’s Methods: Example
• Six people eat dinner in a restaurant. Liz has soup, a hamburger, ice cream, french fries, and mixed vegetables. Tom has salad, soup, fish, mixed vegetables, and ice cream. Andy has salad, a hamburger, french fries, and ice cream. Sue has french fries, a hamburger, and salad. Meg has fish and mixed vegetables. Bill has french fries, a hamburger, and soup. Later, Liz, Tom, and Andy get sick from something they ate, but Sue, Meg, and Bill don’t. What food made the first three diners sick?– Method of Agreement and Difference
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AgreementLiz Tom Andy Sue Meg Bill
Fish *FrenchFries
* *
Hamburger * *Ice Cream * * *MixedVegetables
* *
Salad * *Soup * *
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AgreementLiz Tom Andy Sue Meg Bill
Fish *FrenchFries
* *
Hamburger * *Ice Cream * * *MixedVegetables
* *
Salad * *Soup * *
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DifferenceLiz Tom Andy Sue Meg Bill
Fish * *FrenchFries
* * * *
Hamburger * * * *Ice Cream * * *MixedVegetables
* * *
Salad * * *Soup * * *
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Agreement and DifferenceLiz Tom Andy Sue Meg Bill
Fish * *FrenchFries
* * * *
Hamburger * * * *Ice Cream * * *MixedVegetables
* * *
Salad * * *Soup * * *
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Mill's Method: Concomitant Variation
• Concomitant Variation– A first discovery: the volume knob
– If variations in phenomenon E coincide with variations in phenomenon P, then it is probable that E and P are causally related. (p. 75)
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Mill's Method: Concomitant Variation
• Types of Variance
• Simultaneous(Where antecedent and consequent remains unclear)
versus
• Sequential(Where definite gap exists between antecedent and consequent)
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Mill's Method: Concomitant Variation
• In attempting to diagnose Mrs. Thompson’s high blood pressure, a cardiologist noticed a correlation between fluctuations in blood pressure and certain brain waves. As the blood pressure increased, so did the intensity of the brain waves, and as the blood pressure decreased, the intensity of the brain waves decreased. The cardiologist concluded that the two conditions were causally related.
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Mill's Method: Concomitant Variation
• In attempting to diagnose Mrs. Thompson’s high blood pressure, a cardiologist noticed a correlation between fluctuations in blood pressure and certain brain waves. As the blood pressure increased, so did the intensity of the brain waves, and as the blood pressure decreased, the intensity of the brain waves decreased. The cardiologist concluded that the two conditions were causally related.
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Mill’s Methods: Residue
Characteristic features1. Deals with complex phenomena
2. Established knowledge of some causal factorsa) in measured quantities
Subtract from any phenomenon such part as is known by previous inductions to be the effect of certain antecedents, and the residue (i.e., remaining parts) of the phenomenon is the effect of the remaining antecedents
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Mill’s Method: Residue
• After realizing a loss of $100,000 a department store’s chief accountant could suggest only three causes: an excessive number of clerks, increases in utility rates, and damage to merchandise caused by a flood. These expenses were estimated at $25,000, $30,000 and $10,000 respectively. Since no other ordinary sources could be found, the accountant attributed the remaining $35,000 to shoplifting.
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Mill's Method: Residue
• After realizing a loss of $100,000 a department store’s chief accountant could suggest only three causes: an excessive number of clerks, increases in utility rates, and damage to merchandise caused by a flood. These expenses were estimated at $25,000, $30,000 and $10,000 respectively. Since no other ordinary sources could be found, the accountant attributed the remaining $35,000 to shoplifting.
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Mill’s Methods
1. Agreement
2. Difference– (Agreement & Difference)
3. Concomitant Variation
4. Residue
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Mill’s Methods
1. Agreement
2. Difference– (Agreement & Difference)
3. Concomitant Variation
4. Residue
Typically establishes sufficient conditions
Establishes variable relations
Establishes partial causation
A causal conclusion is strong to the degree that it is supported by premises with evidence of one or more
of Mill’s methods (p. 79)
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Homework
• Analogies– pp. 81-90
• Review:– Exercises (models for exam)• Analogical Reasoning, e.g., ex. 8.4• Causal Argumentation, e.g., 8.3b• Inductive Generalization, e.g., 8.2b