By Geoff Der

ISBN-10: 158488245X

ISBN-13: 9781584882459

The authors lined many issues in utilized facts, yet they did not point out whatever approximately time sequence research. i'm disenchanted after interpreting this publication. the most important challenge with this publication is that it really is overly simplistic - regularly just one method is illustrated for every subject - for instance, in cluster research, basically hierarchical clustering used to be pointed out and there has been not anything approximately partitional set of rules. The authors simply used very small datasets, which missed the largest strength of SAS, the facility to address huge datasets. The authors additionally published all uncooked datasets within the booklet, which took quite a lot of space.

The authors may still learn Venables and Ripley's glossy utilized information with SPlus first. Venables/Ripley made a good instance on how one can write an utilized statistics publication utilizing a particular software program.

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**Example text**

For a Wilcoxon test, the npar1way procedure is used with the wilcoxon option. 14. 47). Using a test that assumes equal variances in the two populations or one that does not make this assumption (Satterthwaite [1946]) makes little difference in this case. The t-test on the untransformed hardness variable also indicates a difference, with the mean hardness in the North being far less than amongst towns in the South. Notice here that the test for the equality of population variances (one of the assumptions of the t-test) suggests that the variances differ.

7 ©2002 CRC Press LLC The first step in examining the relationship between mortality and water hardness is to look at the scatterplot of the two variables. 8. The plot shows a clear negative association between the two variables, with high levels of calcium concentration tending to occur with low mortality values and vice versa. 8 The pearson and spearman options in the proc corr statement request that both types of correlation coefficient be calculated. The default, if neither option is used, is the Pearson coefficient.

The necessary instructions are symbol1 value=dot; symbol2 value=circle; proc gplot; plot mortal*hardness = location; run; The plot statement of the general form plot y * x = z will result in a scatter plot of y by x with a different symbol for each value of z. In this case, location has only two values and the first two plotting symbols used by SAS are 'x' and '+'. The symbol statements change the plotting symbols to give more impact to the scattergram. 10. There appears to be no obvious difference in the form of the relationship between mortality and hardness for the two groups of towns.