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You should do the data processing step outside of the model formula/fitting. When creating the factor from b you can specify the ordering of the levels using factor(b, levels = c(3,1,2,4,5)). Do this in a data processing step outside the lm() call though. My answer below uses the relevel() function so you can create a factor and then shift the reference level around to suit as you need to.
Excel has recently introduced a huge feature called Dynamic arrays. And along with that, Excel also started to make a " substantial upgrade " to their formula language. One such upgrade is the addition of @ operator which is called Implicit Intersection Operator. How is it used The @ symbol is already used in table references to indicate implicit intersection. Consider the following formula in ...
Now Excel will calculate regressions using both x 1 and x 2 at the same time: How to actually do it The impossibly tricky part there's no obvious way to see the other regression values. In order to do that you need to: select the cell that contains your formula: extend the selection the left 2 spaces (you need the select to be at least 3 cells ...
To solve this problem in Excel, usually I would just type in the literal row number of the cell above, e.g., if I'm typing in Cell A7, I would use the formula =A6. Then if I copied that formula to other cells, they would also use the row of the previous cell. Another option is to use Indirect(), which resolves the literal statement inside to be a formula. You could use something like ...