Manuals/calci/TREND

TREND(y,x,x1,c)

• $y$ is the set of y values.
• $x$ is the set of x values.
• $x_{1}$ is the new x value.
• $c$ is the constant value.

Description

• This function calculating the trend line using the given set of $y$ and $x$ values.
• Trend line is the straight line which joins two or more points in the upward direction.
• It is calculating using the equation $y=mx+b$,which is the simple equation for the straight line.
• In this equation $x$ is the independent variable, $y$ is the dependent variable, $m$ is the slope of the line and $b$ is the constant which is equal to $y$ when $x=0$.
• In $TREND(y,x,x_{1},c)$, $y$ is the set of y-values to find the linear trend, $x$ is the set of x- values to find the linear trend, $x_{1}$ is the set of new x-values for which the function calculates corresponding new y-values and $c$ is the constant.
• It is either TRUE or FALSE. If c value is TRUE or omitted, then it is calculated normally.
• If $c$ value is FALSE, then $c=0$, and $y=mx$. Here $y$ is required. $x$,$x_{1}$ and $c$ are optional.
• If $x$ value is omitted, then it is assumed to be the array{1,2,3..} which is the same size of $y$. If $x_{1}$ value is omitted, then it is assumed to be the same size of $x$.
• If both $x$ and $x_{1}$ are omitted, then they are assumed to be the array {1,2,3..} which is the same size of y.
• $TREND$ function is used for polynomial curve fitting by regressing against the same variable raised to different powers.
• When entering an array constant for an argument such as $x$, use commas to separate values in the same row and semicolons to separate rows.

Examples

Spreadsheet

	DAYS(x)	SALES(y)	x1
1	1	40	10
2	2	35	11
3	3	42	12
4	4	50	13
5	5	54	14
6	6	49
7	7	51
8	8	58
9	9	60

TREND(B1:B9,A1:A9,C1:C5)

62.611111111111114,etc

TREND(B1:B9,A1:A9,C1:C5,FALSE)

82.84210546,etc

See Also

• GROWTH
• LINEST
• LOGEST