"January's PSI suggests that the services sector is still chugging along relatively well, as we head into 2019, rather than fading as a backbone to GDP growth," he said.
The PSI's sister survey, the performance of manufacturing index, which was released on Friday, showed growth in new orders slowed for a third month in January, raising the prospect of a slowdown.
Combining the two surveys, the index of composite performance rose 2.3 points in January compared with December - reaching 56.1 on a GDP-weighted basis. It was also higher than the 55.4 reading a year earlier. On a free-weighted basis, the compositive measure edged up 0.2 of a point month-on-month to 55.3, but was down from 55.9 a year earlier.
The PSI's employment sub-index rose 2.6 points to 52.9, above the 50.7 reading a year earlier, while supplier deliveries edged up 0.2 of a point to 51.9, and was below the 53.4 reading a year earlier.
The only sub-index below the 50 mark - indicating a contraction in activity - was a 49.9 reading for stocks/inventories, down from 51.2 in December and 53.2 a year earlier.
BNZ's Ebert said the dip in the inventories index appeared to be driven by the increase in sales and new orders.
- BusinessDesk