Problem with interpretation of exchange rate
NEER stands for nominal effective exchange rate and not the Swiss local currency. Essentially, this takes into account how the local currency moves with respect to its trading partners.

Example: if Switzerland trades only with the UK, an appreciation of the Swiss franc compared to USD would not make a difference to exporters/importers in Switzerland if GBP also appreciate against the USD by the same amount. In this case, NEER would remain the same.

Without knowing which article you're referring to (which "coefficient"), I can't say much about your other questions. In general, however, an appreciation in the currency, holding other currencies constant, will lead to an increase in NEER.