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310 Formula Editor Chapter 9 Ordering Expressions in Formulas Ordering Expressions in Formulas As you build a formula, keep in mind that all functions have an order of precedence shown in the following table, where level one is the highest order of precedence. Expressions with a high order of precedence are evaluated before those at lower levels. When an expression has operators of equal precedence, it is evaluated from left to right. You can use parentheses to override other precedence rules when necessary because any expression within parentheses is always evaluated first. Terms have no order of precedence because they cannot be evaluated further. Table 9.5 shows the first six levels of the order of precedence. Table 9.5 Order of Precedence of Operators in Formulas Level 1 Parentheses Level 2 Functions in the function browser lists, And, Or, Not Level 3 *, ÷, Modulo Level 4 +, - Level 5 Comparisons: , ≤ x
Chapter 9 Formula Editor 311 Using Formula Editor Options 5 Click column B in the Table Columns list. 6 Click the addition button ( ) in the formula editor keypad. 7 Click column C in the Table Columns list. 9Formulas Because the order of precedence determines which arguments are affected by each functions, it also affects the grouping of expressions. Select functions in the formula to verify how the order-of-precedence rules have been applied. Structuring Formulas for Efficient Evaluation Usually, it is not necessary to structure formulas with efficient evaluation in mind. Most formulas evaluate almost instantaneously regardless of their structure. This is because statistical functions and constant expressions are evaluated only once when a column’s values are calculated. However, when you are creating conditional expressions, keep in mind that Match evaluates faster and uses less memory than an equivalent Condition function, If. (Note that Match ignores trailing spaces, while If does not.) Consider two formulas for predicting a child’s height from his age shown in Figure 9.22. In each case there is a base height of 58.125 inches to which a quantity is added depending on the value of the age variable. Figure 9.22 The Match Conditional Evaluates Faster Than the If Function The Match conditional evaluates faster than the If function because the age variable is evaluated only once for each row in the data table. The If condition must evaluate the age variable at each If clause for each row until a clause evaluates as true. Using Formula Editor Options There are several options the formula editor makes available to you as you create formulas. The following sections discuss each of these options.
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Release 8 User Guide Second Edition
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Contents JMP User Guide 1 Prelimina
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iii Data Filter Control Panel . . .
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v Editing Data Table Rows using the
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vii Example of Tabulating Data . .
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ix Closing and Saving Sessions . .
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xi C The Analyze Menu . . . . . . .
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xiv Linda Blazek, Michael Friendly,
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Chapter 1 Preliminaries JMP Statist
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Chapter 1 Preliminaries 3 What You
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Chapter 1 Preliminaries 5 Learning
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Chapter 2 Creating and Opening File
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. Chapter 2 Creating and Opening Fi
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Contents Elements of JMP Data Table
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50 Entering, Editing, and Managing
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Contents Saving Data Tables . . . .
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110 Saving Tables, Reports, and Ses
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Contents Assigning Characteristics
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132 Properties and Characteristics
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All analyses produce report windows
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Chapter 6 Output Reports 171 Editin
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Chapter 6 Output Reports 177 Printi
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Chapter 6 Output Reports 179 Saving
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Chapter 6 Output Reports 181 Format
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Chapter 6 Output Reports 183 Format
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Chapter 6 Output Reports 185 Select
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Chapter 6 Output Reports 187 Using
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Chapter 6 Output Reports 195 Alteri
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Chapter 6 Output Reports 211 Adding
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Chapter 7 Reshaping Data Subset, Co
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Chapter 7 Reshaping Data 223 Creati
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Chapter 7 Reshaping Data 225 Sortin
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Chapter 7 Reshaping Data 227 Stacki
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Chapter 7 Reshaping Data 233 Splitt
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Chapter 7 Reshaping Data 235 Splitt
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Chapter 7 Reshaping Data 237 Transp
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Chapter 7 Reshaping Data 239 Transp
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Chapter 7 Reshaping Data 241 Concat
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Chapter 7 Reshaping Data 243 Concat
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Chapter 7 Reshaping Data 245 Joinin
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Chapter 7 Reshaping Data 257 Updati
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Page 280 and 281: Contents Summarizing Columns. . . .
Page 282 and 283: 264 Summarizing Data Chapter 8 Summ
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Page 304 and 305: Contents Creating a Formula . . . .
Page 306 and 307: 288 Formula Editor Chapter 9 Refere
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Page 336 and 337: 318 Formula Editor Chapter 9 Custom
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360 Personalizing JMP Chapter 10 Pe
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366 Personalizing JMP Chapter 10 Me
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368 Personalizing JMP Chapter 10 Cu
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374 Personalizing JMP Chapter 10 Sa
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376 Personalizing JMP Chapter 10 Sa
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Contents Connecting to SAS. . . . .
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380 SAS Integration Chapter 11 Conn
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382 SAS Integration Chapter 11 Conn
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384 SAS Integration Chapter 11 Open
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390 SAS Integration Chapter 11 Runn
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392 SAS Integration Chapter 11 Subm
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394 SAS Integration Chapter 11 Retr
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Appendix A JMP Starter A Review of
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Appendix A JMP Starter 399 Overview
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Appendix A JMP Starter 401 The Basi
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Appendix A JMP Starter 403 The Mode
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Appendix A JMP Starter 405 The Mult
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Appendix A JMP Starter 407 The Grap
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Appendix A JMP Starter 409 The Grap
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Appendix A JMP Starter 411 The Meas
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Appendix A JMP Starter 413 The DOE
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Appendix A JMP Starter 415 The Tabl
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Appendix A JMP Starter 417 The SAS
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Contents The JMP Menu (Macintosh On
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422 Main Menu Appendix B The File M
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424 Main Menu Appendix B The Edit M
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426 Main Menu Appendix B The Edit M
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428 Main Menu Appendix B The Rows M
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430 Main Menu Appendix B The Cols M
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432 Main Menu Appendix B The DOE Me
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434 Main Menu Appendix B The Analyz
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440 Main Menu Appendix B The Graph
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442 Main Menu Appendix B The Graph
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444 Main Menu Appendix B The Tools
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446 Main Menu Appendix B The View M
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448 Main Menu Appendix B The Window
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450 Main Menu Appendix B The Help M
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452 Main Menu Appendix B The Layout
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Contents Row Functions . . . . . .
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456 Formula Functions Reference App
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Index JMP User Guide Symbols 468 !
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Index 497 levels in a report 171 re
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Index 499 delete expression 294 del
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Index 501 conditional clauses 302 c
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Index 503 range check 53 red triang
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Index 505 Marker functions 308 Mark
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Index 507 operating characteristic
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Index 509 report tables 183 reports
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Index 511 shapes. See drawing tools
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Index 513 units 160 univariate stat
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