Excel's Formula - sisman

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232 Part II: Using Functions in Your Formulas Figure 8-17: Column B contains formulas that perform a lookup using linear interpolation. It’s critical that the values in the x range appear in ascending order. If B1 contains a value less than the lowest value in x or greater than the largest value in x, the formula returns an error value. Table 8-2 lists and describes these formulas. Table 8-2: Formulas for a Lookup Using Linear Interpolation Cell Formula Description B3 =LOOKUP(B1,x,x) Performs a standard lookup on the x range and returns the lookedup value. B4 =B1=B3 Returns TRUE if the looked-up value equals the value to be looked up. B6 =MATCH(B3,x,0) Returns the row number of the x range that contains the matching value. B7 =IF(B4,B6,B6+1) Returns the same row as the formula in B6 if an exact match is found. Otherwise, it adds 1 to the result in B6. B9 =INDEX(x,B6) Returns the x value that corresponds to the row in B6. B10 =INDEX(x,B7) Returns the x value that corresponds to the row in B7. B12 =LOOKUP(B9,x,y) Returns the y value that corresponds to the x value in B9. B13 =LOOKUP(B10,x,y) Returns the y value that corresponds to the x value in B10. B15 =IF(B4,0,(B1-B3)/(B10-B9)) Calculates an adjustment factor based on the difference between the x values. B16 =B12+((B13-B12)*B15) Calculates the estimated y value using the adjustment factor in B15. Combining the lookup and trend functions Another slightly different approach, which you may find preferable to performing lookup using linear interpolation, uses the LOOKUP and TREND functions. One advantage is that it requires only one formula (see Figure 8-18).
Chapter 8: Using Lookup Functions 233 Figure 8-18: This worksheet uses a formula that uses the LOOKUP function and the TREND function. The formula in cell B2 follows. This formula uses an IF function to make a decision. If an exact match is found in the x range, the formula returns the corresponding y value (using the LOOKUP function). If an exact match is not found, the formula uses the TREND function to return the calculated “best-fit” y value. (It does not perform a linear interpolation.) =IF(B1=LOOKUP(B1,x,x),LOOKUP(INDEX(x,MATCH (LOOKUP(B1,x,x),x,0)),x,y),TREND(y,x,B1))
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Excel ® Microsoft 2010 ® Microsof
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Excel® 2010 Formulas Published by
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Publisher’s Acknowledgments We’
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vi Part VII: Appendixes Appendix A:
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viii Keyboard shortcuts . . . . . .
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x Potential Problems with Names . .
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xii Date-Related Functions . . . .
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xiv Working with Tables . . . . . .
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xvi Chapter 13: Financial Schedules
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xviii Creating Links to Cells . . .
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xx Excel’s Auditing Tools . . . .
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xxii Does the text match a pattern?
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1 INTRODUCTION Welcome to Excel 201
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VBA code listings Introduction 3 Do
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Introduction 7 You can also use thi
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Basic Information Chapter 1 Excel i
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Let Excel insert functions for you
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Figure 6-10: This worksheet convert
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Round it up to the nearest penny.
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Introducing Arrays In This Chapter
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Chapter 14: Introducing Arrays 369
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Figure 14-4: Creating a named array
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Introducing VBA In This Chapter ●
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Figure 22-2: The Macro Settings sec
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Introducing the Visual Basic Editor
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Immediate window Chapter 22: Introd
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The Count property Chapter 24: VBA
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A Multifunctional Function Chapter
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For i = 2 To TextLen If Mid(text, i
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Function RANGERANDOMIZE(rng) Dim V(
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Appendixes Appendix A Excel Functio
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768 Part VII: Appendixes Turn off
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770 Index array formulas (continued
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772 Index CONVERT function, 275-277
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776 Index For-Next loops, 652-654 F
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778 Index LOGNORMDIST function, 718
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784 Index tables (continued) rows,
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786 Index VBA (continued) data type
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788 Index
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5. Limited Warranty. (a) WPI warran
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