Within-Cases: Multivariate approach part one
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1 Within-Cases: Multivariate approach part one /* sleep2.sas */ options linesize=79 noovp formdlim=' '; title "Student's Sleep data: Matched t-tests with proc reg"; data bedtime; infile 'studentsleep.data' firstobs=2; /* Skip the header */ input patient xsleep1 xsleep2; sleepdif = xsleep2-xsleep1; /* Create a new variable */ proc means n mean stddev t probt; var sleepdif; proc reg; model sleepdif = ; /* Just the intercept: beta0 = mu */ Unnecessary: test intercept = 0; Student's Sleep data: Matched t-tests with proc reg 1 Analysis Variable : sleepdif N Std Dev t Value Pr > t Student's Sleep data: Matched t-tests with proc reg 2 Dependent Variable: sleepdif Number of Observations Read 10 Number of Observations Used 10 Error Corrected Total Root MSE R-Square Dependent Adj R-Sq Coeff Var Page 1 of 5
2 Intercept Student's Sleep data: Matched t-tests with proc reg 3 Test Unnecessary Results for Dependent Variable sleepdif Source DF Square F Value Pr > F Numerator Denominator Compare Analysis Variable : sleepdif N Std Dev t Value Pr > t Page 2 of 5
3 /* grapefruit1.sas */ options linesize=79 pagesize=100 noovp formdlim='_' nodate; title "Oneway ANOVA with repeated measures: Hotelling's T-Squared Approach"; title2 'Grapefruit data (Kutner et al. 5th ed. Prob 27.6)'; data grape1; infile 'grapefruit1.data' firstobs=2; /* Skip the labels */ input store sales1-sales3; label sales1 = 'Sales at Price 1' sales2 = 'Sales at Price 2' sales3 = 'Sales at Price 3'; d12 = sales1-sales2; d13 = sales1-sales3; d23=sales2-sales3; proc means n mean stddev; var sales1-sales3; proc reg; title3 ''; model d12 d13 = ; Price: mtest intercept=0; proc means mean t probt; title3 'Pairwise matched t-tests'; var d12 d13 d23; Oneway ANOVA with repeated measures: Hotelling's T-Squared Approach 1 Variable Label N Std Dev sales1 Sales at Price sales2 Sales at Price sales3 Sales at Price Oneway ANOVA with repeated measures: Hotelling's T-Squared Approach 2 Dependent Variable: d12 Number of Observations Read 8 Number of Observations Used 8 Page 3 of 5
4 Error Corrected Total Root MSE R-Square Dependent Adj R-Sq Coeff Var Intercept Oneway ANOVA with repeated measures: Hotelling's T-Squared Approach 3 Dependent Variable: d13 Number of Observations Read 8 Number of Observations Used 8 Error Corrected Total Root MSE R-Square Dependent Adj R-Sq Coeff Var Intercept <.0001 Page 4 of 5
5 Oneway ANOVA with repeated measures: Hotelling's T-Squared Approach 4 Multivariate Test: Price Multivariate Statistics and Exact F Statistics S=1 M=0 N=2 Statistic Value F Value Num DF Den DF Pr > F Wilks' Lambda Pillai's Trace Hotelling-Lawley Trace Roy's Greatest Root Oneway ANOVA with repeated measures: Hotelling's T-Squared Approach 5 Pairwise matched t-tests Variable t Value Pr > t d d <.0001 d Page 5 of 5
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