Univariate & bivariate analysis

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  2. 2. UNIVARIATE BIVARIATE & MULTIVARIATE UNIVARIATE ANALYSIS -One variable analysed at a time BIVARIATE ANALYSIS -Two variable analysed at a time MULTIVARIATE ANALYSIS -More than two variables analysed at a time
  4. 4. DESCRIPTIVE ANALYSIS Transformation of raw data Facilitate easy understanding and interpretation Deals with summary measures relating to sample data Eg-what is the average age of the sample?
  5. 5. INFERENTIAL ANALYSIS Carried out after descriptive analysis Inferences drawn on population parameters based on sample results Generalizes results to the population based on sample results Eg-is the average age of population different from 35?
  6. 6. DESCRIPTIVE ANALYSIS OF UNIVARIATE DATA 1. Prepare frequency distribution of each variable
  7. 7. Missing Data Situation where certain questions are left unanswered
  8. 8. Analysis of multiple responses
  9. 9. Measures of central tendency 3 measures of central tendency 1.Mean 2.Median 3.Mode
  10. 10. MEAN Arithmetic average of a variable Appropriate for interval and ratio scale data x
  11. 11. MEDIAN Calculates the middle value of the data Computed for ratio, interval or ordinal scale. Data needs to be arranged in ascending or descending order
  12. 12. MODE Point of maximum frequency Should not be computed for ordinal or interval data unless grouped. Widely used in business
  13. 13. MEASURE OF DISPERSION Measures of central tendency do not explain distribution of variables 4 measures of dispersion 1.Range 2.Variance and standard deviation 3.Coefficient of variation 4.Relative and absolute frequencies
  14. 14. DESCRIPTIVE ANALYSIS OF BIVARIATE DATA There are three types of measure used. 1.Cross tabulation 2.Spearmans rank correlation coefficient 3.Pearsons linear correlation coefficient
  15. 15. Cross Tabulation Responses of two questions are combined
  16. 16. Spearmans rank order correlation coefficient. Used in case of ordinal data