Hi Sander, yes Thank you, that works well.
Actually looked at Ratios and Differences in the documentation prior to posting. Being new at this and not speaking the language was too hung up on the semantics, not really seeking a ratio (how many times one number contains another) or difference (subtracting one number from another) and did not think or know to use the modifiers to the statement.
Really trying feverishly to learn the language, but If I may be so bold as to ask another question; how do I get past the date?
Import from excel looks like this:
1981-01-05 1596.6
1981-01-12 1600.1
1981-01-19 1606.8
1981-01-26 1609.4
1981-02-02 1608.6
Thank you for the help, kind regards, Kelly.