Lecture 7& 8 Using Basic Statistical Procedures

Lecture 7& 8 Using Basic Statistical Procedures -...

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I OWA S TATE U NIVERSITY Department of Animal Science Using Basic Graphical and Statistical Procedures (Chapter in the 8 Little SAS Book) Animal Science 500 Lecture No. 7 September 21, 2010
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I OWA S TATE U NIVERSITY Department of Animal Science SAS Graphical Capabilities SAS has an extensive graphical ability Can graph your distribution with a normal distribution overlay Can graph various bar graphs However it may not be as intuitive to use Various styles of graphs can be used
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I OWA S TATE U NIVERSITY Department of Animal Science SAS Graphical Capabilities Many other programs that are available that are easier to use and more intuitive Other programs with graphical capabilities more easily interface with word processing and other software
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I OWA S TATE U NIVERSITY Department of Animal Science Assumptions of the Analysis of Variance The analysis of variance has basic assumptions 1. Treatments randomly applied experimental units 2. Independence of residuals (,ij) within groups 3. Homogeneity of residual variances among groups 4. Treatment observations normally distributed
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I OWA S TATE U NIVERSITY Department of Animal Science Proc Univariate Proc Univariate can be used to request a variety of statistics to summarize the data distribution of each analysis variable: 1. Sample moments 2. Basic measures of location and variability 3. Confidence intervals for the mean, standard deviation, and variance 4. Tests for location 5. Tests for normality 6. Trimmed and Winsorized means 7. Robust estimates of scale 8. Quantiles and related confidence intervals 9. Extreme observations and extreme values 10. Fequency counts for observations 11. Missing values
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I OWA S TATE U NIVERSITY Department of Animal Science Proc Univariate Using various options in the PROC UNIVARIATE statement user can do the following: 1. Specify the input data set to be analyzed 2. Secify a graphics catalog for saving traditional graphics output 3. Specify rounding units for variable values 4. Specify the definition used to calculate percentiles 5. Specify the divisor used to calculate variances and standard deviations 6. Request that plots be produced on line printers and define special printing characters used for features 7. Suppress tables 8. Save statistics in an output data set
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I OWA S TATE U NIVERSITY Department of Animal Science Proc Univariate Output The UNIVARIATE Procedure Variable: write (writing score) Moments N 200 Sum Weights 200 Mean 52.775 Sum Observations 10555 Std Deviation 9.47858602 Variance 89.843593 Skewness -0.4820386 Kurtosis -0.7502476 Uncorrected SS 574919 Corrected SS 17878.875 Coeff Variation 17.9603714 Std Error Mean 0.67023725 Basic Statistical Measures Location Variability Mean 52.77500 Std Deviation 9.47859 Median 54.00000 Variance 89.84359 Mode 59.00000 Range 36.00000 Interquartile Range 14.50000
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I OWA S TATE U NIVERSITY Department of Animal Science Proc Univariate Output meaning a. Moments - Moments are a statistical summaries of a distribution.
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Lecture 7& 8 Using Basic Statistical Procedures -...

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