SAS Essentials: A Guide to Mastering SAS for Research
Alan C. Elliott
Format: PDF / Kindle (mobi) / ePub
SAS Essentials provides an introduction to SAS statistical software, the premiere statistical data analysis tool for scientific research. Through its straightforward approach, the text presents SAS with step-by-step examples. With over fifteen years of teaching SAS courses and over fifty combined years of teaching and consulting by the authors, this valuable reference presents data manipulation and statistical techniques, including a website with examples. This textbook is essential for teachers because the chapters are self-contained and may be used accordingly to the teacher?s preference, whether for a one-semester or two-semesters course.
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Examples of correct SAS variable names: GENDER AGE_IN_1999 (notice underscores) AGEin1999 _OUTCOME (notice the leading underscore) HEIGHT_IN_CM (notice underscores) WT_IN_LBS (notice underscores) And here are some examples of incorrect SAS variable names: AGE IN 2000 2000MeaslesCount S S Number Question 5 WEIGHT IN KG AGE-In-2000 c02.indd 23 10/15/09 4:21:20 PM 24 Getting Data into SAS These variable names are incorrect because some include blanks (S S Number, AGE IN 2000, Question 5,.
Chart 320 14.8 Means with error bars 323 14.9 Boxplots showing highway MPG by cylinders 325 14.10 Boxplots with enhancements 326 14.11 Graphics output from ODS 328 14.12 ODS graphics output from PROC CORR 330 15.1 ODS TRACE output 339 15.2 Drill-down plot, first run 341 10/16/09 6:44:42 PM Figures and Tables 16.1 Excel data to import into SAS via the clipboard 353 16.2 Data written to an Excel spreadsheet from SAS 357 16.3 Data from the COMPLICATIONS data set 367.
Graph with words (PENETRATE and NONPENETRATE) rather than with the 0, 1 data codes. (See Chapter 3 for more information on PROC FORMAT.) CLASS statement In this example two grouping variables are indicated in the CLASS statement. For example, CLASS WOUND GENDER; (Continued ) c06.indd 153 10/15/09 4:29:56 PM 154 Evaluating Quantitative Data HISTOGRAM The options within the HISTOGRAM statement define how the graph will appear. The statements NROWS=2 NCOLS=2 produce two histograms per row (for.
Are collected as counts require a specific type of treatment. It doesn’t make sense to calculate means and standard deviations on this type of data. Instead, categorical data (also called qualitative data) are often analyzed using frequency and cross-tabulation tables. The primary procedure within SAS for this type of analysis is PROC FREQ. USING PROC FREQ PROC FREQ is a multi-purpose SAS procedure for analyzing count data. It can be used to obtain frequency counts for one or more single.
Our first example is a quick overview of how SAS works. You should not be concerned if you don’t know much about the information in the SAS program file at this point. The remainder of the book teaches you how to create and run SAS programs. HANDS-ON EXAMPLE In this example you’ll run your first SAS analysis. 1. Launch SAS by double-clicking the SAS icon on your desktop or by selecting Start Programs SAS. (To put the SAS program icon on your desktop, consult your Windows documentation.) SAS.