LINEST 
LINEST(known_y's [,known_x's] [,const] [,stats]) 
Returns the array of values for a straight line that best fits your data. 
known_y's  The set of yvalues for the equation (y = mx + c). 
known_x's  (Optional) The set of xvalues for the equation (y = mx + c). 
const  (Optional) A logical value indicating whether the constant c is to equal 0: True / 1 = c is calculated normally (default) False / 0 = c is equal to 0. 
stats  (Optional) A logical value indicating whether to return additional regression statistics: False / 0 = only the mcoefficients and the constant b are returned (default) True / 1 = additional regression statistics are returned 
REMARKS 
* This function always returns multiple values. * For an illustrated example refer to the page under Advanced Functions * This function had to be entered as an Array Formula before Excel 2021. * Calculates the statistics for a line by using the "least squares" method. * If "known_y's" is in a single column, then each column of "known_x's" is interpreted as a separate variable. * If "known_y's" is in a single row, then each row of "known_x's" is interpreted as a separate variable. * The "known_x's" can include one or more sets of variables. * If "known_x's" is left blank, it is assumed to be the array {1,2,3,} that is the same size as "known_y's". * If "const" = True, then c is calculated normally. * If "const" = False, then c = 0 and the equation (y = mx) is used. * If "const" is left blank, then True is used. * If "stats" = False, then only the mcoefficients and the constant b are returned. * If "stats" = True, then Additional Regression Statistics are returned. * If "stats" is left blank, then False is used. * If only one variable is used, "known_y's" and "known_x's" can be ranges of any shape, as long as they have equal dimensions. * If more than one variable is used, "known_y's" must be a vector (that is, a range with a height of one row or a width of one column). * In Excel 2010 the accuracy of this function was improved. * For the Microsoft documentation refer to support.microsoft.com * For the Google documentation refer to support.google.com 

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