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You use Excel's linear regression functions to find a linear equation that best describes a data set.

Excel uses the sum of least squares method to find the straight line of best fit. People often

try to predict future amounts by assuming linear growth and extending the line forward in

time. For example, if you have a series of sales data for 9 months and want to predict the

sales in the 10th month, you can use Excel's linear regression functions to find the slope and

y-intercept (the point on the y-axis where the line crosses) of the line that best fits the data.

Some Background Info on Linear Regression

To use the linear regression functions, it helps to remember the equation for a line:

y=mx+b

where y is the dependent variable, m the slope, x the independent variable, and b the

y-intercept. If there are multiple ranges of x values, the equation looks like this:

y=m1 x1+m2x2+.mnxn+b

NOTE To visualize and experiment with linear regression, visit the interactive web page at

[http://www.math.csusb.edu/faculty/stanton/m262/regress/regress.html]. Click the

graph area to add data points (x,y) to the graph. The applet draws the straight line

that best fits the points you add, adjusting the line for the new data points you add.

Using the FORECAST Function

The FORECAST function predicts a future y-value for the x-value you specify using existing

x and y values. The FORECAST function uses the following syntax:

=FORECAST(x, known ys, known xs)

where x is the x-value for which you want to predict a y-value.

Using the INTERCEPT Function

If you have existing x and y values, Excel can find the straight line that best fits the data and then calculate the point at which the line intersects the y-axis, in other words, the value of b in the "y=mx+b" equation. The y-intercept is useful when you want to know the value of the dependent variable when the independent variable equals 0.

NOTE: The INTERCEPT function returns the same value as the FORECAST function if you enter 0 for x in the FORECAST function.

The INTERCEPT function uses the following syntax:

=INTERCEPT (known ys, known xs)

Using the LINEST Function

The LINEST function returns the value of m and b given at least one set of known ys and known xs. The LINEST function has the following syntax:

=LINEST (known ys, known xs, constant, statistics)

where known ys is the array of y values you already know, known xs is the array of x values you may already know. If you leave out the known xs, they are assumed to be 1, 2, 3,...n. If constant is set to FALSE, b is assumed to be 0. If statistics is set to TRUE, the LINEST function also returns the standard error for each data point.

NOTE: If the known ys are in a single column or row, then Excel considers each column of

known xs to be a separate variable.

NOTE: The array known xs can include multiple sets of variables. If you use only one set, then known ys and known xs can be ranges of any shape, as long as they have equal dimensions. If you use more than one variable, then the known ys array must be either a single column or a single row. If you don't enter known xs, Excel assumes this array is the same size as the known ys array.

Using the SLOPE Function

Use the SLOPE function to find the slope (m) of the linear regression line from the known x and known y data sets. The slope is the change in y over the change in x for any two points on the line. The SLOPE function in Excel uses the following syntax:

=SLOPE (known ys, known xs)

A positive (upwards) slope means that the independent variable (such as the number of salespeople) has a positive effect on a dependent variable (such as sales). A negative (downwards) slope means that the independent variable has a negative effect on the dependent variable. The steeper the slope, the more effect the independent variable has on the dependent variable.

Using the STEYX Function

Use the STEYX function to find the standard error of the predicted y-value for each individual x in the regression. The STEYX function uses the following syntax:

=STEYX (known ys, known xs)

Using the TREND Function

Use the TREND function to find values along a linear trend. Specify an array of new xs and the TREND function uses the method of least squares to fit a straight line to the known x and y data sets and return the y-values along the line for the new array. If constant is set to FALSE, the "b" in the y=mx+b equation is set to zero. The TREND function uses the following syntax:

=TREND (known ys, known xs, new xs, constant)

Stephen L. Nelson, CPA wrote the MBA's Guide to Microsoft Excel, from which this short article is adapted. Nelson also writes and edits downloadable do-it-yourself small business incorporation kits that businesses and investors can use for setting up a Michigan S Corporation or a Minnesota S Corporation

Toys: A Kid's Best Friend

We never stop fantasizing about things we want in life especially those that are out of our reach. Super sports car or luxury car are one such item of desire on top of our want lists. Our mind gets stuck at the sight of the latest automobile flashing down the road and all we desire is to lay our hands on one such beauty. And when we talk about kids, they are not all that different from us. But children, who are into cars, don't settle for less. They play with the latest remote car toys, the ones that resemble the hottest car models in the market.

The stores, these days, are flooded with toy cars of all shapes and sizes to entice kids. The variety ranges from model cars to remote toy cars, the latter being more engaging and exciting. If your kids like playing with cars you can buy one such toy for them and see how you bring a smile to their face. You can be part of your kid's play, by helping them build a race track of sort by using normal household stuff. The remote car toy helps in developing eye hand coordination of your child and add thrill to their life as they steer through the race course.
Toys these days are often inspired from the famous cartoon series that kid's watch. You can find a wide variety of cartoon based toys these days like the Ben10 car toys, watches etc. They signify a new generation of toys and are very famous among kids who want to be like their super hero and use stuff like them. Apart from cartoon based toys, kids really love remote car toys that look like the new launched sports cars or miniature version of the famous luxury car brands.

Talking about other types of car toys, you can find a segment that caters to both old and young kids as well as adults. These remote controlled cars are big with lot of additional feature and are quite powerful compared to a normal toy car. There are several clubs that people have formed where they meet over the weekend and indulge in playing with such cars. If your child is an enthusiast who loves to build things, do-it-yourself kits are also available that come with full set of instructions and parts to build your own model.

A kid's childhood is incomplete without toys and apart from exc
itement and fun; toys do provide a way to teach kids other aspects of life. Like the remote car toys help in building quick responses to various hurdles and sharpens brain. When we look back at our childhood we can surely recollect the toys we use to play with and often find ourselves living twice with our kids by being part of their playtime. So let's give our children a childhood filled with excitement, fun and learning, something they will cherish even as they grow up. And for kids, come lets play.

About the Author

Andre Williams shares his views about Super sports car. For more information on remote car toys please visit www.ibazaarindia.com

Planning a long cross country tour on a motorcycle... I'm thinking the BMW F650GS, What do you think?

I've been riding for about 3 years now. I've had mostly street legal dirt bikes. My fist bike was a 2007 KLX250 that I put almost 12000 miles on in one year. I moved up to a KLX 400 w/ a big bore 440 kit. Tons of fun in the woods. Then I got a 2003 KTM 200 exc. All were street legal and plated but I never did more then 50 or 60 miles a day. (Except for the KLX 250, I rode that thing all day every day everywhere around town, just not on the highways)

I'm looking to buy a BMW F650GS to take me across country through back roads, dirt trails, highways, campsites and whatever else I may encounter. I know for sure I wouldn't take the KLX 440... too light, no wind screen, vibrates like all hell, and its hard to pack gear on.

Thoughts? Ideas? Previous Trip experiences?

Thanks!

The BMW will do it. It will be pretty nice on the road for a 650, and pretty heavy off-road. Fine for gravel roads and 2-track, but a bit unwieldy as the going gets rougher. Its fuel-injected engine will get better gas mileage than the other 650s. Luggage capacity is not a problem. If you can't pack everything you need for a month or two, then you are bringing way too much crap.

I think the KLR650 is better bang for the buck, and you can load it up just as well with available luggage from a number of sources.

My favorite in the class, however, is the Suzuki DR650. It isn't got quite as roomy with camping gear, but packing light is always a virtue. Put a Corbin seat and IMS 4.9 gal. tank on it.

I have traveled extensively on 650 dual sports. It's harder to rack up the big-mileage days than it is with a dedicated road bike, but if you keep to 250-400 miles a day and take all the detours and back routes you can find you will have an excellent adventure.

Jury convicts Palin e-mail intruder on 2 counts; mistrial declared on ID theft
KNOXVILLE — A federal jury this afternoon convicted Sarah Palin e-mail intruder David C. Kernell of felony destruction of records to hamper a federal investigation and misdemeanor unlawfully obtaining information from a protected computer.

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