This article throws light upon the seven important types of agricultural statistics. The types are: 1. Elements of Statistics 2. Distribution 3. Skewness 4. Kurtosis 5. Correlation and Regression 6. Probability 7. Tests of Significance.
Agricultural Statistics: Type # 1. Elements of Statistics:
(a) Averages/Arithmetic Mean:
It is a figure obtained by dividing the sum of all variable by their total number of variables.
Properties of Arithmetic Mean:
1. Sum of deviation of items from the A.M. is always 0.
2. A.M. is affected by change in origin and scale.
Agricultural Statistics: Type # 2. Distribution:
(a) Symmetrical Distribution: Mean = Median = Mode
(b) Asymmetrical distribution: [Mode = 3 Median – 2 Mean]
(c) Moderate skewed distribution: Mean – mode = 3 (Mean – Median)
Agricultural Statistics: Type # 3. Skewness:
(a) The measures of the direction and degree of a asymmetry are called measure of skewness.
Agricultural Statistics: Type # 4. Kurtosis:
Agricultural Statistics: Type # 5. Correlation and Regression:
(a) Correlation:
To study the association or degree & deviation between two or more variables.
Properties of Correlation Coefficient:
1. It lies between -1 to +1, if it is 0; there is no relationship between variables.
2. It is geometric mean of two regression coefficient.
3. Independent of change of scale and origin of the variable.
(b) Regression:
To measure the average relationship between two or more variables.
Properties of Regression Coefficient:
1. The value of regression coefficient should not exceed 1 or equal.
2. It gives the cause and effect of relationship.
3. Regression coefficients are not symmetric.
4. Independent of change of origin but not of scale.
Agricultural Statistics: Type # 6. Probability:
a Probability refers to chance of happening or not happening of an event.
b. It is the science of Decision.
c. Probability = No. of favourable cases / Total no. of equally likely cases
d. If a card is drawn from a pack of cards, the probability of getting a king or queen is 2/13.
e. Probability ranges from 0 to 1.
Agricultural Statistics: Type # 7. Tests of Significance:
