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Tham khảo tài liệu 'exploratory data analysis_3', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | I.3.3.6. Box-Cox Normality Plot Related Techniques Normal Probability Plot Box-Cox Linearity Plot Software Box-Cox normality plots are not a standard part of most general purpose statistical software programs. However the underlying technique is based on a normal probability plot and computing a correlation coefficient. So if a statistical program supports these capabilities writing a macro for a Box-Cox normality plot should be feasible. Dataplot supports a Box-Cox normality plot directly. NIST SEMATECH HỬME tools AIDS SÉAỀCH back NỄXĨ http www.itl.nist.gov div898 handbook eda section3 eda336.htm 3 of 3 5 1 2006 9 56 33 AM I.3.3.7. Box Plot hW ENGINEERING STATISTICS HANDBOOK TOOLS raids I search back NEKT 1. Exploratory Data Analysis 1.3. EDA Techniques 1.3.3. Graphical Techniques Alphabetic 1.3.3.7.Box Plot Purpose Check location and variation shifts Box plots Chambers 1983 are an excellent tool for conveying location and variation information in data sets particularly for detecting and illustrating location and variation changes between different groups of data. Sample Plot This box plot reveals that machine has a significant effect on energy with respect to location and possibly variation This box plot comparing four machines for energy output shows that machine has a significant effect on energy with respect to both location and variation. Machine 3 has the highest energy response about 72.5 machine 4 has the least variable energy response with about 50 of its readings being within 1 energy unit. http www.itl.nist.gov div898 handbook eda section3 eda337.htm 1 of 3 5 1 2006 9 56 33 AM I.3.3.7. Box Plot Definition Box plots are formed by Vertical axis Response variable Horizontal axis The factor of interest More specifically we 1. Calculate the median and the quartiles the lower quartile is the 25th percentile and the upper quartile is the 75th percentile . 2. Plot a symbol at the median or draw a line and draw a box hence the name--box plot between the lower .
