QBO3 Matrix "All" values - fuzzy-logic

Question

I have a QBO3 Matrix with a single Investor input, and a bunch of outputs:
| Investor | Output1 | Output2 | Output3 |
| -------- | ------- | ------- | ------- |
| 1,2,3 | A | B | C |
| 4,5 | D | E | F |
| 6,7,8 | D | B | G |
...
We now want to add a new "LoanType" input.
Is there a way to have the investor Code field count for ‘ALL’?
If I leave the field blank and select ‘Do Not Match’ will that apply to anything but NULL in that field?
Is there a way to only account for the Investors already listed in the Matrix without having to list them all in the Investor Code field?

Answer 1

TLDR; use input weights to get your desired result.
Assuming you added a LoanType input with the following rows:
| Investor | LoanType | Output1 | Output2 | Output3 |
| -------- | -------- | ------- | ------- | ------- |
| 1,2,3 | | A | B | C | row 1
| 4,5 | | D | E | F | row 2
| 6,7,8 | | D | B | G | row 3
| | Jumbo | H | I | F | row 4
...
Is there a way to have the Investor field count for 'ALL'?
Yes. Row 4 has no Investor specified, so all Jumbo loans would consider row 4 a possible match, regardless of investor.
If I leave the field blank and select ‘Do Not Match’ will that apply
to anything but NULL in that field?
Yes, but this is not recommended. If you do this, it will match a NULL investor, and it will match any "valid" investor value. This is equivalent to simply not entering anything at all.
Is there a way to only account for the Investors already listed in the
Matrix without having to list them all in the Investor Code field?
Yes, using weights.
I'm inferring from your question that if you have:
Investor = 27 (where Investor 27 does not appear in any other rows in the Matrix)
LoanType = "Jumbo"
you want row 4, but if you have:
Investor = 8 (where Investor 8 appears in another row in the Matrix), and
LoanType = "Jumbo"
you want to match row 3.
If this assumption is correct, you just need to set the Investor input weight to be higher than the LoanType weight. For example:
Investor.Weight = 10
LoanType.Weight = 5
In this scenario, given the inputs Investor = 8 and LoanType = "Jumbo", you would have:
| Investor | LoanType | Output1 | Output2 | Output3 | Weight |
| -------- | -------- | ------- | ------- | ------- | ------ |
| 6,7,8 | | D | B | G | 10 |
| | Jumbo | H | I | F | 5 |
| 1,2,3 | | A | B | C | 0 |
| 4,5 | | D | E | F | 0 |
...
Thus, your Investor match outweighs your LoanType match.
Lastly, if you had a rare use case where Investor = 2 and LoanType = "Jumbo" should result in Jumbo results, you can just add a row for that use case:
| Investor | LoanType | Output1 | Output2 | Output3 |
| -------- | -------- | ------- | ------- | ------- |
| 1,2,3 | | A | B | C | row 1
| 4,5 | | D | E | F | row 2
| 6,7,8 | | D | B | G | row 3
| | Jumbo | H | I | F | row 4
| 2 | Jumbo | H | I | F | row 5
...