## Welcome to this Blog: Excel with ExcelMaster

### 21 05 2015

This Blog was initially called Excel 2007 with ExcelMaster. Time has passed now and we’ve got Excel 2016

Anyway, this Blog contains an ever growing set of detailed pages on How to … do things and pages of simple but very useful Tips.

**19th June 2016**: 1 How about finding the IRR of a Perpetuity? I came across a question on that on quora.com and answered it. I know I did not answer the question in the way the questioner was asking but I like my answer anyway! IRR of a Perpetuity in the How to … Other menu … here

2 Secret Graph and Graph Your Name. You can create graphs without having any data on a work sheet … did you know? That means you can put just about anything you like on a graph. It’s a bit dot matrix but it works and with your flair and imagination it could look magical! Excel How to charts menu … here

**31st May 2016**: You know you want to know how to prepare your own population pyramid in Excel. Well now’s your chance. This new page is on the Excel How to … Charting … … but click here to go straight there! **1st June 2016** … **I have UPDATED this page and the Excel file …**

**25th May 2016**: Do you use LINEST? Try this, then, if you want your output to have more flexibility. Combine INDEX and LINEST. See the page of that name under Excel How … Others … menu

**2nd May 2016: **a page about library fines … from almost 70 years ago … present values and so on. Menu … how to … other!!

**11th April 2016**: 1 **Power BI** … if you’ve never heard of it or seen it, you are in for a treat. Here is the first of what I imagine will be many pages on that topic. I give you here a basic example of how to import a CSV file into Power BI and how to analyse the data you import. It’s so simple to use and so powerful at the same time. You will find this page under the Excel How to … Other menu.

2 Here is a page for anyone who has or who is about to **upgrade** to Excel 2016: Forecasting in Excel 2016. You will probably e surprised by what you read as they have done something different this time. At the same time as including some new forecasting functions, they have included a utility to go with it. You will find this page under the Excel How to … Other menu.

**14th March 2016**: A Sparkline revelation. Go to the How to Graphs … menu to see a miraculous Sparkline. Sparklines … REALLY … truly exciting!

**2nd February 2016**: Something a little bit different. There is no page today but a booklet. As you know, I published a 585 page book on Excel (The Excel Project) on amazon.co.uk in 2012. The book has sold slowly but it is a very good and comprehensive book. What I have done is to rework chapter one of that book to create a booklet that is aimed at the beginner. Hence the tile * Microsoft Excel for Absolute Beginners*. It is ready and available now free of charge. To get the book, send me a message via this blog and make sure I know what you want! In the past I have had messages that say nothing: no subject, no content; and I was supposed to work out what they wanted. I will send you the 36 page booklet by email as soon as I get your request.

**26th January 2016**: Learning Power Pivot? Then you need to see my new page: Power Pivot v VLOOKUP, SUMIFS and Rearranging. It’s in the How to … Others Menu. It’s an introduction only and in this case I don’t provide you with everything you need … read the page to see what I mean.

If you’d like my help and guidance on something, just ask and I’ll do what I can.

Duncan Williamson

Introduction for Absolute Beginners: Introduction to Excel for Absolute Beginners

Excel Files for Practice:

The basics of spreadsheeting 1

The basics of spreadsheeting 2

The basics of spreadsheeting 3

The basics of spreadsheeting 4

## Business Intelligence

### 30 03 2016

Are you interested in using BI? Do you already use it?

Did you know that BI is free to create?

I will be adding some BI resources here this week … but there are already some here! Take a look at Power Query and Power Pivot for a start.

Back soon and if there’s something you want me to write about, let me know.

Duncan Williamson

## SUMDIVIDE … sort of

### 08 03 2016

A delegate asked me today if there was such a function as SUMDIVIDE. There isn’t of course, but I found a way to simulate it.

What would SUMDIVIDE do? SUMDIVIDE would have array 1 divided by array 2 and the results then added together: in the same way that SUMPRODUCT multiplies and then adds.

This is how it works: imagine A1:A5 contains array 1 and B1:B5 contains array 2 then the SUMPRODUCT function to divide them will be =SUMPRODUCT(A1:A5,1/B1:B5). Simple, eh? Who’d have thought it would be so simple.

Duncan Williamson

## Are you Following me?

### 07 03 2016

Time is just flying by and although I’ve got so many things to share time is against me.

In addition to this blog you might want to follow me on LinkedIn too … I don’t accept everyone there but if you tell me you subscribe to this blog I guarantee acceptance.

I am working in Dubai this week: presenting a three day course on Financial Modelling and Business Intelligence. Then a two day course on Budgeting and Cost Control.

With my courses you get a tool box of functions and techniques. You also get one to one time with me as I solve your problems … financial modelling etc! You take away all of my notes and PowerPoint slides as well as all of my fully worked Excel files.

I use real world data in my models and demonstrations. You get full explanations from me. I am also honest: if you ask me something I will give you the right answer, even if it means I have to do further research or ask a friend!

Find out where I am working and what I am doing and who knows, you might even join me one day. Invite me to speak where you are and maybe we can get together that way.

Duncan Williamson

## New Video! –

### 12 12 2015

## New Video! –

### 01 11 2015

## Oil Tanker Problem

### 06 09 2015

**Introduction**

Last night I was finishing off some work when I came across a problem on a help site: the problem had been posted in December 2014 and hadn’t been answered. I realise that 9 months is a long time but I wanted to understand the problem and see if I could provide a solution: I did both!

One of the difficulties with the problem as stated was that the questioner asked for a nested IF solution, He insisted. Other people tried to help him and he duly provided a mock up of his worksheet for us all. Again he talked about a nested IF statement solution and even provided one … that he freely admitted didn’t work.

The problem is this:

- there are two oil storage tanks and oil is first measured by means of a dip stick which is then used to estimate the amount of oil in the tanks
- the oil is stored for days at a time and each day new oil is added
- every now and again, though, the tanks are drained

He said that by taking the differences between opening and closing stocks for each day he can estimate the amount of oil added; and by adding together the results for the two tanks he gets overall additions for a day.

Good!

Then he says the problem comes when the tanks are drained … his calculation shows a negative result for dranage day!

I translated his graphic into a worksheet and here it is.

The question is: can you solve his problem?

This table starts in B7 and in L11 there is a formula: =E11-E10+H11-H10

That formula is then filled down to the end of the table, day 31 in cell L41

You can see the problem clearly in the second part of the table, day 27 , where they have drained the first tank overnight:

That’s it: I solved this problem … can you? Let me know and I will share my solution. If you ask, you must tell me what you did to try to solve it. No try, no get!😉

Duncan Williamson