Similarities and differences between ratio IQ and dispersion IQ

The first intelligence test was the Bine-Simon Intelligence Scale, and they proposed the concept of "mental age", which refers to the fact that the results of the test are expressed as the average age of normal children who achieve a certain score, and in layman's terms, it is to see that the child's performance is comparable to the average score of children of which age.

Next, Meng Zhikai modified this, that is, Stanford.

The Ratio Scale puts forward the concept of "Ratio IQ", which is easier to understand, which is the value of mental age divided by biological age and multiplied by 100.

Then Wetsler in his Wechsler intelligence scale.

, the ratio IQ is replaced by the dispersion IQ. The reason for this is that Ratio IQ assumes that people's IQ increases linearly with age, but in fact, in early adulthood, our intelligence will not increase greatly, and in old age it will even decline due to physiological aging and cognitive deterioration.

Thus Liang Hail's discrete IQ arises, which abandons intellectual age, but takes into account the individual's relative position among his peers, and calculates that his performance deviates from the average of his peers.

How many standard deviations.

to determine the oak sails.

To put it simply, the difference between dispersion IQ and ratio IQ is that deviation IQ is a comparison between an individual and his peers to see how much he is above or below the average to get a number. The ratio IQ is simply divided and only applies to children.

Merit. Compared with ratiometric IQ, it has the advantage that the same intelligence score represents the same relative position at any age level, and is no longer plagued by different IQ variability at different age levels. If there is a change, it can be determined that there is a change in a person's intelligence.

Ratio IQ has been replaced by a wide range of applications in the Frank Intelligence Test.

Dispersion IQ is a form of IQ, an indicator of the level of intellectual development, which was pioneered by the American psychologist Wechsler in the intelligence test. It takes the intelligence distribution of all people in a certain age group as the positive pre-starvation distribution, takes the average IQ of the age group as the reference point, and uses the standard deviation as the standard deviation to obtain the standard score of the individual in the intelligence test. Indicates the level of intelligence of a certain body compared to people of the same age group.

Dispersion IQ is a form of IQ, an indicator of the level of intellectual development, which was pioneered by the American psychologist Wechsler in the intelligence test. It takes the intelligence distribution of all people in a certain age group as a normal distribution, takes the average IQ of the age group as a reference point, and uses the standard deviation as the standard deviation to obtain the standard score of an individual in the intelligence test. Indicates the level of intelligence of a certain body compared to people of the same age group.

The mean of the dispersion IQ is usually 100, and the standard deviation is 15 on the Wechsler Intelligence Scale and 16 on the Stanford-Bine Scale. Dispersion IQ = 100 + 15z or = 100 + 16z

Dispersion IQ is the relative position of individuals in a group of the same conditions (e.g., the same age group), and it is essentially a relative score obtained by comparing an individual's performance with the average score of participants in the same age group. The basic assumption of ratio IQ is that intellectual development is directly proportional to age, a linear relationship, a longitudinal comparison within the individual himself. Formula for calculating Ratio IQ:

IQ = (age of intelligence, chronological age) x 100. Intellectual age, also known as "mental age", referred to as "intellectual age", is relative to actual age (biological age). This term was first proposed and adopted by Binet.

Intellectual age refers to the level of intelligence that children in a certain age group can achieve on average. For example, if an 8-year-old child performs as well as an ordinary 10-year-old child on an intelligence test, we say that the child's intelligence age is 10 years old. The IQ of a student in question 2 is 115, which means that his intelligence ( ) a

Excellent bUpper middle cLower middle d

Analysis of lower answers [Answer] B [Analysis] A large number of studies have shown that people's intelligence levels are normally distributed (also known as bell distribution). The vast majority of people are moderately intelligent, i.e., in the middle of 90-109. 80-89 is lower-middle, 110-119 is upper-middle, 120-139 is excellent, and below 70 is mentally retarded.

It can be seen that the IQ level of 115 is at the upper middle level

Dispersion IQ is a standard score calculated from a sample of age groups. Dispersion IQ = 100 + 15z, where z = (x-m) s, where m represents the average score of the body, x represents the take-home score of the individual test, s represents the standard deviation of the team score, and z represents the position of the person in the team, i.e., his standard score.

The Comea IQ is a standard score calculated from an age group. Wechsler set the mean of the deviation IQ at 100 and defined the standard deviation as 15. The deviation IQ is based on statistics, which indicates the position of individual intelligence in the age group, and is therefore an ideal indicator of intelligence, iq=100+15z=100+15(x-m) s.

Dispersion IQs obtained from different tests can only be compared if the standard deviations are the same or close.