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Simple Mathematics Behind Stock Analysis and Selection

Updated on April 4, 2019
Babu Mohan profile image

I am a marketing professional from India holding a postgraduate degree in Management.

Need for long-term orientation

Stock markets may not appear to be driven by logic and reason at a point of time. But over a longer period, logic and reason could explain the market movement.

I have lost money with a short-term approach and I made all my good investment decisions with a long-term approach. Stock market returns would be attractive only if one stays invested in good companies for long, say ten years at the minimum.

Trading room in action
Trading room in action | Source

Key Metrics to Analyze Stocks

Stock analysis is not rocket science. The following simple metrics are more than enough to assess a stock.

1) Sales

2) Profitability

3) Key ratios like PE, P /B & debt-equity ratios

4) Dividend yield

5) Historic trends

I would focus on the techniques involved in assessing stocks to demystify the process of stock analysis and stock selection.


Sales is the most important factor one should look at. The patronage of loyal customers and good sales are indicators of a company's health. We may know of many good companies doing well in the marketplace in visible industries like FMCG, pharma and automobiles. In unfamiliar categories like certain industrial products, we can get the sales numbers through a net search.

The company's sales should also be compared with its competitors to see its relative strength. If a company has good sales numbers, then it clears the first test.

Sales is the most important factor one should look at. The patronage of loyal customers and good sales are indicators of a company's health.


Some companies report good sales but they may not be profitable. It is possible that such companies do not have a sustainable business model to survive in the long run. On the contrary, it is also possible that the company is in the initial investment phase and would make profits later.

There are so many companies that are already profitable with good sales numbers. Instead of breaking our heads about whether a loss making company would become profitable later, we can stick to companies that are already profitable.

Net profit margin = net profits / sales

Higher the net profit margin, better is the financial health. So profitability is the next step in assessing stocks.

Stock Comparison Table - An Illustration

Company A
Company B
Company C
$14.5 million
$14.5 million
$100.0 million
Net profit margin
PE ratio
Dividend yield
Clearly Company A & B have better value compared to Company C on all parameters except total sales.

Key Financial Ratios

A company with good sales and profitability may not be attractive if its share price is very high. Buying such an expensive scrip would not give us great returns. There are also good companies at reasonable or bargain rates. These scrips have a better potential to grow. Would we buy a new Mini at $1 billion even though most of us may love the car? Same logic applies to stocks as well. We should buy good stocks at the right price.

The financial ratios like PE, P / B and debt-equity ratio would help us understand if the share is priced right or not.

Price-earnings ratio (PE) = share price / earnings per share

Lesser PE ratio for a stock compared to the index PE would mean that the stock is undervalued. A higher PE ratio for a stock would mean that it is overvalued. Lesser the PE, better would be the prospects of returns. The Dow Jones Industrial had a PE of around 19 on 17th January 2019 and the Indian Nifty had a PE of around 26.

Price to book ratio (P / B) = share price / book value per share

A lesser P / B ratio would be preferable. For instance, a P/B ratio of 100 would mean that the stocks are overpriced by 100 times over the book value. This would mean that the stock is way too expensive compared to its asset value.

Debt-equity ratio = Total debt / equity capital

This again is a critical metric as more debt exposure would mean a risky business model. A lower debt-equity ratio is always a healthy sign. A company's debt-equity ratio should be less than the average debt-equity ratio of the industry. One should opt for companies with debt-equity ratio of 1 or less.

Dividend is a sign that the company's profits are real. For working professionals, it is also a great source of passive income that can grow over time.

Dividend Yield

Dividend is a portion of the company's profits that gets distributed to shareholders. It is a sign that the company's profits are real. For working professionals, it is a great source of passive income that has the potential to grow over time.

Dividend yield = dividend per share / share price

The dividend yield for Dow Jones Industrial is 2.33% and Indian Nifty is 1.24℅. One can find stocks with higher dividend yield than the respective indices. A dividend income is also handy even as we enjoy the benefits of long-term capital appreciation when the share price goes up.

After applying these 4 metrics, our list of good stocks would shrink but we would be left with gems. There is still one final test to clear, the history.

Illustration of Historic Sales Trends

Company A
Company B
Company C
Year 0
$10.0 milllion
$16.0 million
$98.0 million
Year 1
$11.0 million
$15.0 million
$98.0 million
Year 2
$11.5 million
$15.5 million
$102..0 million
Year 3
$12.5 million
$14.5 million
$101.0 million
Year 4
$14.0 million
$14.5 million
$99.0 million
Year 5
$14.5 million
$14.5 million
$100.0 million
Company A seems to be on a better growth path with a CAGR of 7.7%. All things considered, Company A is the best scrip with a good PE ratio, dividend yield and sales growth.

Historical Trends

After looking at the above 4 metrics, one should not forget to look at the historical performance of the company. One should look at the history of a stock for the last 5 or 10 years.

One should identify stocks where sales, profits and dividends are growing over the years. A consistent dividend payout coupled with a growing sales is a very healthy sign. Once we look at several companies using all these 5 metrics, we can select the good investment options.

CAGR for a 5-year period = (Year 5 sales / Year 0 sales) ^ (1/5)-1

Compound annual growth rate (CAGR) of sales, profits and dividends would indicate how well the company has fared.

Apart from the numerical analysis, one should also look at the qualitative aspects. The online retail is threatening to take a huge share of market from organized retail. The younger generation is becoming conscious of their looks and this would mean growth opportunities for personal care products and services. Internet has become an integral part of our lives and there is a growing need for better online security. We can expect companies specializing in online security to do well. Such qualitative insights are useful.

Can we go wrong when we find growing companies with a dividend yield that beats bond yield or deposit rates? As greedy as this requirement may seem, we can find such hidden gems in every market. If we stick to fundamentals and stay invested for the long, we can see the best possible returns from stock markets.

This article is accurate and true to the best of the author’s knowledge. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters.

Please leave your valuable comments.

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    • Babu Mohan profile imageAUTHOR

      Mohan Babu 

      3 months ago from Chennai, India

      Thanks Umesh Chandra Bhatt for your valuable comments. Hope there was some new information for you.

    • bhattuc profile image

      Umesh Chandra Bhatt 

      3 months ago from Kharghar, Navi Mumbai, India

      Well explained. Thanks.

    • Babu Mohan profile imageAUTHOR

      Mohan Babu 

      4 months ago from Chennai, India

      I agree with you Eurofile. Long term perspective is a main if not the only requirement to be a successful investor.

    • Eurofile profile image

      Liz Westwood 

      4 months ago from UK

      Your article echoes the impression that I have picked up about stocks. Namely that you have to be in the market long term to make the big overall gains.


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