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Relative Addresses: After I enter =B2/52 in cell C2 and then drag it down the C column to the last row what formula would I see in cell C5 if I clicked.

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Presentation on theme: "Relative Addresses: After I enter =B2/52 in cell C2 and then drag it down the C column to the last row what formula would I see in cell C5 if I clicked."— Presentation transcript:

1 Relative Addresses: After I enter =B2/52 in cell C2 and then drag it down the C column to the last row what formula would I see in cell C5 if I clicked on it? ABC 1PID (faked)PointsPercent A)=B2/52 B)=B2/55 C)=B5/52 D)=B5/55

2 Conditional/If Function: What would be the correct function to type into cell C2 to indicate either “passed” or “failed”. Assume anyone who earned more than 30 pts passed. ABC 1PID (faked)PointsPassed? A)=IF(B2>30,”passed”,”failed”) B)=IF(B2>=30,”passed”,”failed”) C)=IF(B2>30,”failed”,”passed”) D)=IF(B2>=30,”failed”, “passed”

3 The COUNT function counts the number of cells in a range with numerical data in them What does the COUNTA function return in this case? =COUNTA(A2:C5) ABC 1PID (faked)PointsPassed passed passed passed passed A)4 B)8 C)12 D)None of the above

4 Relative Addressing Copy A2 into D2 and into B3: What formula would be in each? D2B3 A=A1-11 B=D1-11=B1-11 C=D1-11=B2-11 ABCD =A

5 Excel: Formulas and Functions Data (and increasingly large amounts of it) permeates our society and our disciplines – Those who can leverage computational tools and techniques for analyzing it will be primed to make contributions Excel is an amazingly powerful tool for – Data analysis – Data visualization We’ll find a new level of “understanding” of many Excel tools given our understanding of core computing concepts gained in Alice

6 Working Example: CSE3 grades in Excel Many profs keep track of grades in excel – Scantron form scanned, ed as CSV (comma separated value), which is imported to Excel (chapter 3) – Each row has 2 entries* Student PID Number of points *Actually I get the direct scans and do my own grade calculations, so I can give partial credit… more later

7 An Example of a Common Organization National Data Buoy Center: – Station (LLNR 984.6) NM Southeast of Anchorage, AK(LLNR 984.6) #YY MM DD hh mm ss T HEIGHT #yr mo dy hr mn s - m

8 Faked: Dental Data Last NameFirst NameInsurance #Contact PhoneLast Cleaning RamirezJose /26/09 SongSally /29/10

9 Faked: UCSD Class Lists LastName, FirstName PIDCollege Staus Smith, Tanya Ann csd.edu FR Alvarado, Maria sd.edu SO

10 What BEST explains in English the “purpose” of this formula? A.It generates the values 22, 33, 44 and 55 B.It generates a value which is 11 less than the top value in that column C.It generates a value which is 11 less than the value in the cell directly above it D.None of the above ABCD =A

11 Absolute Reference: Uses in grading CSE3 midterms Keeping the “total number of points” – Rather than “hard coding” the number 52 in the equation, it should always use the number in B2 Easy for someone “looking” at the sheet to see the max points ABC 152 2PID (faked)PointsPercent =B3/ Let’s Change this

12 What would be the right formula: Given I want to be able to copy/drag it into ANY column on the sheet and get the grade for that row A.=B3/B$1 B.=B3/$B$1 C.=$B3/B$1 D.=$B3/$B$1 ABC 152 2PID (faked)PointsPercent =B3/ Let’s Change this

13 More CSE3 Midterm Analysis: How many people picked a specific distractor Count of each item (A-E) in a column – I’ll enter into B6: = COUNTIF(B$2:B$4,=“A”) I want to drag it down over the next three rows and then just change A to B, or C or D (less typing) ABC 1PID (faked)Q1Q AD C D A B 5 6Count of As 7Count of Bs 8Count of Cs 9Count of Ds

14 Why do I use absolute addressing for the ROW? A.Because you want to be able to easily drag this equation across all the columns (questions on exam) without having to change it B.Because you want to make sure it always performs COUNTA on rows 2-4 C.I don’t know ABC 1PID (faked)Q1Q AD C D A B 5 6Count of As 7Count of Bs 8Count of Cs 9Count of Ds = COUNTIF(B$2:B$4,”=A”) In B6

15 In Excel, a relative reference (no $) (compared to an absolute reference (with $))… A.Keeps the same row, column reference when you copy it into another cell B.Changes the row, column reference when you copy it into another cell, based on the value in the original cell C.Changes the row, column reference when you copy it into another cell, based on the location of the new cell compared to the old one

16 Absolute Addressing is useful for A.When you want to always reference the same column, no matter where you copy it B.When you want to always reference the same row, no matter where you copy it C.When you always want to reference the same cell, no matter where you copy it D.More than one of the above is true

17 Suppose I have two classes grades, in different sheets I find the average in the first class (Sheet1: B5) Then I’ll copy that over to (Sheet2: B4) so I’ll have the average grade for that class as well AB 1PIDPoints =AVERAGE(B2:B4) AB 1PIDPoints

18 What is in B4 in Sheet2? A.39 B.50 C.78 AB 1PIDPoints =AVERAGE(B2:B4) AB 1PIDPoints D. Excel gives an error E. None of the above

19 Which of the following would cause a circular reference if I entered it in B2 and dragged it across row 2? A.=B1+B3 B.=A2+C2 C.Neither of those D.Both of those ABCD

20 Assume this function is put into I1 and then copied down to I4, =IF(H1="OK",G1+$F$1,G1-F1) What is in Cell I3? A.2 B.5 C.9 D.15

21 Assume this function is put into I1 and then copied down to I4, =IF(H1="OK",G1+$F$1,G1-F1) What is in Cell I4? A.2 B.5 C.12 D.15

22 Assigning points with If commands

23 What is the correct formula to use For Question 1 – D was worth 2 points – C was worth 1 point – Others worth 0 points A.=IF(B3=“D”,2), IF(B3=“C”,1,0)) B.=IF(B3=“D”,2,IF(B3=“C”,1,0)) C.=IF(B3=“C”,1,IF(B3=“D”,2,0)) D.More than one of the above E.None of the above

24 Match your PID (from scantron) to name (from classlist) In one sheet, I have the midterm scanned data – I’ve used if statements to assign points per question and summed them to get exam points In another sheet I have the downloaded class roster – (which usually has some people who didn’t take the exam – not the same number of rows) – It has PID and Name on each row Goal: Add a column in midterm sheet with the matching name for each student

25

26 What commands would you use to fill A3? A.An IF command B.An IF command with nested IFs C.A VLOOKUP command D.A VLOOKUP command with an IF nested in it E.A COUNTA function

27 To calculate A3= VLOOKUP(B3,classList!A$1:B$572,2,TRUE) For all items_in_classList_ColA one at a time If item_in_classList_ColA == midterm!B3 midterm!A3’s value is classList!B(index) else Do Nothing


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