Statistical Techniques for Handling Missing Data
Statistical Techniques for Handling Missing Data Dr. John M. Cavendish
4 Part a1 Data were collected from 430 undergraduate college students for the purpose of examining the relationship between student personality characteristics and their preference for personality styles in their lecturers. Table 1 below presents a summary of the data collected. Of the 430 subjects for whom data was attempted, with 5 subjects providing no data, Of the 425 subjects included in data analysis, 307 were female, 117 were male, and 1 failed to indicate their gender. With the exception of Age and Student wants Extroversion in lecturers, the Coefficients of Skewness and Kurtosis are within normal limits. In the instance of Age, the lower outliers are obviously mistakes, since it would be impossible to have students with age 0 and 2 years old in the study. However, even when they are eliminated, this variable does not approach normality. It is also apparent from Table 1 that all variables have missing values. While most have less than 5% of the values missing, the Student wants Extroversion in lecture variable has 147 (34%) of its values missing.
Table 1 Summary of Lecture Preference Study Data N Statistic lecturE Age studentN studentE studentO studentA studentC lectureN lecturO lecturA lecturC Valid N (listwise) 283 404 420 418 418 413 416 417 420 417 417 265 Statistic 12.96 19.60 23.63 30.10 28.83 46.52 30.20 -21.69 8.77 8.88 16.29 Mean Std. Error .413 .172 .420 .309 .304 .367 .331 .448 .394 .469 .378 Std. Deviation Statistic 6.945 3.448 8.604 6.319 6.219 7.453 6.755 9.144 8.085 9.576 7.719 Skewness Statistic .017 2.350 .005 -.459 .161 -.136 .029 1.910 .161 -.154 -.496 Kurtosis Statistic -.239 17.989 -.312 .671 -.462 .204 1.040 4.948 -.213 -.467 -.115
The scatterplots for the following variable combinations (Student Agreeableness/Lecture Agreeableness; Student Extroversion/Lecture Extroversion; Student Agreeableness/Lecture Extroversion; Student Extroversion/Lecture
4 Part a1 Data were collected from 430 undergraduate college students for the purpose of examining the relationship between student personality characteristics and their preference for personality styles in their lecturers. Table 1 below presents a summary of the data collected. Of the 430 subjects for whom data was attempted, with 5 subjects providing no data, Of the 425 subjects included in data analysis, 307 were female, 117 were male, and 1 failed to indicate their gender. With the exception of Age and Student wants Extroversion in lecturers, the Coefficients of Skewness and Kurtosis are within normal limits. In the instance of Age, the lower outliers are obviously mistakes, since it would be impossible to have students with age 0 and 2 years old in the study. However, even when they are eliminated, this variable does not approach normality. It is also apparent from Table 1 that all variables have missing values. While most have less than 5% of the values missing, the Student wants Extroversion in lecture variable has 147 (34%) of its values missing.
Table 1 Summary of Lecture Preference Study Data N Statistic lecturE Age studentN studentE studentO studentA studentC lectureN lecturO lecturA lecturC Valid N (listwise) 283 404 420 418 418 413 416 417 420 417 417 265 Statistic 12.96 19.60 23.63 30.10 28.83 46.52 30.20 -21.69 8.77 8.88 16.29 Mean Std. Error .413 .172 .420 .309 .304 .367 .331 .448 .394 .469 .378 Std. Deviation Statistic 6.945 3.448 8.604 6.319 6.219 7.453 6.755 9.144 8.085 9.576 7.719 Skewness Statistic .017 2.350 .005 -.459 .161 -.136 .029 1.910 .161 -.154 -.496 Kurtosis Statistic -.239 17.989 -.312 .671 -.462 .204 1.040 4.948 -.213 -.467 -.115
The scatterplots for the following variable combinations (Student Agreeableness/Lecture Agreeableness; Student Extroversion/Lecture Extroversion; Student Agreeableness/Lecture Extroversion; Student Extroversion/Lecture