In the quest to find great investments, most investors focus on earnings to gauge a company's financial strength. This is a good start, but earnings can be misleading and incomplete. To get a clearer understanding of a company's ability to earn money and reward you, the shareholder, it's often better to focus on cash flow. In this series, we tear apart a company's cash flow statement to see how much money is truly being earned, and more importantly, what management is doing with that cash.

Step on up, Stryker (NYSE: SYK).

The first step in analyzing cash flow is to look at net income. Stryker's net income over the last five years has been impressive:

 

2011*

2010

2009

2008

2007

Normalized Net Income $1.2 billion $1.2 billion $1.0 billion $1.0 billion $0.9 billion

Source: S&P Capital IQ. *12 months ended Sept. 30.

Next, we add back in a few non-cash expenses like the depreciation of assets, and adjust net income for changes in inventory, accounts receivable, and accounts payable -- changes in cash levels that reflect a company either paying its bills, or being paid by customers. This yields a figure called cash from operating activities -- the amount of cash a company generates from doing everyday business.

From there, we subtract capital expenditures, or the amount a company spends acquiring or fixing physical assets. This yields one version of a figure called free cash flow, or the true amount of cash a company has left over for its investors after doing business:

 

2011*

2010

2009

2008

2007

Free Cash Flow $1.1 billion $1.4 billion $1.3 billion $1.0 billion $0.8 billion

Source: S&P Capital IQ. *12 months ended Sept. 30.

Now we know how much cash Stryker is really pulling in each year. Next question: What is it doing with that cash?

There are two ways a company can use free cash flow to directly reward shareholders: dividends and share repurchases. Cash not returned to shareholders can either be stashed in the bank, used to invest in other companies, or to pay off debt.

Here's how much Stryker has returned to shareholders in recent years:

 

2011*

2010

2009

2008

2007

Dividends $269 million $238 million $198 million $136 million $90 million
Share Repurchases $854 million $426 million -- $1 billion --
Total Returned to Shareholders $1.1 billion $664 million $198 million $1.1 billion $90 million

Source: S&P Capital IQ. *12 months ended Sept. 30.

As you can see, the company has repurchased a decent amount of its own stock. That's caused shares outstanding to fall:

 

2011*

2010

2009

2008

2007

Shares Outstanding (millions) 390 396 397 408 410

Source: S&P Capital IQ. *12 months ended Sept. 30.

Now, companies tend to be fairly poor at repurchasing their own shares, buying feverishly when shares are expensive and backing away when they're cheap. Does Stryker fall into this trap? Let's take a look:

Sykbuybacks

Source: S&P Capital IQ.

There's not quite enough information here to get a grasp on management's behavior. Stryker repurchased a lot of stock in 2008 when shares were fairly high, and none in 2009 when they were fairly low, but repurchases have been so sporadic over the last five years that this could have been an anomaly. Given what look like reasonable valuations in relation to earnings and cash flow, these buybacks have likely been a good deal for shareholders.

Finally, I like to look at how dividends have added to total shareholder returns:

Sykreturns

Source: S&P Capital IQ.

Over the last five years, shares returned -10%, which drops to -14% without dividends -- a small boost to top off otherwise poor performance.

To gauge how well a company is doing, keep an eye on the cash. How much a company earns is not as important as how much cash is actually coming in the door, and how much cash is coming in the door isn't as important as what management actually does with that cash. Remember, you, the shareholder, own the company. Are you happy with the way management has used Stryker's cash? Sound off in the comment section below.