Solutions for Data Science

  Formula errors are common. If you have a data set with hundreds of records, a divide-by-zero and an #N/A errors are bound to pop up now and then. In the past, preventing errors required Herculean efforts. Nod your head knowingly if you’ve ever knocked out  =IF(ISNA(VLOOKUP(A2,Table,2,0),"Not Found",VLOOKUP(A2,Table,2,0)) . Besides being really long to type, that solution requires twice as many VLOOKUPs. First, you do a VLOOKUP to see if the VLOOKUP is going to produce an error. Then you do the same VLOOKUP again to get the non-error result. Excel 2010 introduced the greatly improved  =IFERROR(Formula,Value If Error) . I know that IFERROR sounds like the old ISERROR, ISERR, and ISNA functions, but it is completely different. This is a brilliant function:  =IFERROR(VLOOKUP(A2,Table,2,0),"Not Found") . If you have 1,000 VLOOKUPs and only 5 return #N/A, then the 995 that worked require only a single VLOOKUP. Only the 5 VLOOKUPs returned #N/A that need to move on to th...

One-click charts are easy: Select the data and press  Alt+F1 . What if you would rather create bar charts instead of the default clustered column chart? To make your life easier, you can change the default chart type. Store your favorite chart settings in a template and then teach Excel to produce your favorite chart in response to  Alt+F1 . Say that you want to clean up the chart above. All of those zeros on the left axis take up a lot of space without adding value. Double-click those numbers and change Display Units from None to Millions. To move the legend to the top, click the + sign next to the chart, choose the arrow to the right of Legend, and choose Top. Change the color scheme to something that works with your company colors. Right-click the chart and choose Save As Template. Then, give the template a name. (I called mine ClusteredColumn.) Select a chart. In the Design tab of the Ribbon, choose Change Chart Type. Click on the Templates folder to see the template that ...

Toggle navigation   MrExcel Home Here is an odd use for an array formula: Say that you don‘t want anyone to delete or insert any rows in one section of a worksheet. Scroll far to the right, off the screen, and build an array in those rows. Select Z1:Z9. Type  =2  and press  Ctrl+Shift+Enter . You can use any number,  =0 ,  =1 ,  =2 , and so on. If someone tries to delete a row, Excel prevents it and shows a cryptic message about arrays, shown below.

How to Use the RANK Function If you give the RANK function a number, and a list of numbers, it will tell you the rank of that number in the list, either in ascending or descending order. For example, in the screen shot below, there is a list of 10 student test scores, in cells B2:B11. To find the rank of the the first student's score in cell B2, enter this formula in cell C2: =RANK(B2,$B$2:$B$11) Then, copy the formula from cell C2 down to cell C11, and the scores will be ranked in descending order. RANK Function Arguments There are 3 arguments for the RANK function: number : in the above example, the number to rank is in cell  B2 ref : We want to compare the number to the list of numbers in cells  $B$2:$B$11 . Use an absolute reference ($B$2:$B11), instead of a relative reference (B2:B11)so the referenced range will stay the same when you copy the formula down to the cells below order : (optional) This argument tells Excel whether to rank the list in ascending or descending o...

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What if your lookup value is to the right of the information that you want VLOOKUP to return? Conventional wisdom says VLOOKUP cannot handle a negative column number in order to go left of the key. One solution is  =VLOOKUP(I7,CHOOSE({1,2},G1:G5,F1:F5),2,0) . However, I prefer to use MATCH to find where the name is located and then use INDEX to return the correct value.

The DAX language was created specifically for the handling of data models, through the use of formulas and expressions. DAX is used in several Microsoft Products such as Microsoft Power BI, Microsoft Analysis Services and Microsoft Power Pivot for Excel. Below are the types of Dax functions  1. Aggregate  2. Date and time 3. Filter 4. Financial  5. Information  6. Logical 7. Maty and trig 8. Other 9. Parent and child 10. Relationship Management  11. Statistical  12. Table manipulation  13. Text 14. Time intelligence  From the above list of functions 3 types of functions are basic and commonly used, those are Aggregate , Logical and Date and time. Other important entities which are used with the above function are as follows  1. Operators  Example -  ( ), + , Not, &, =, < >, || 2. Statements  Define , Evaluate,  Order by, Return, Var 3. Data Types Binary, boolean,  Currency,  date time, decimal, integer,...

Say you have to urgently submit a file with many sheets. For Example put a Header or write a same  data for all sheets. I will show you an amazingly powerful tool called Group mode. Say that you have 12 worksheets that are mostly identical. You need to add totals to all 12 worksheets. To enter Group mode, right-click on any worksheet tab and choose Select All Sheets. The name of the workbook in the title bar now indicates that you are in Group mode. Anything you do to the January worksheet will now happen to all the sheets in the workbook. Why is this dangerous? If you get distracted and forget that you are in Group mode, you might start entering January data and overwriting data on the 11 other worksheets! When you are done adding totals, don’t forget to right-click a sheet tab and choose Ungroup Sheets.