West Germany's real gross national product (GNP) Rose by 4.3 percent in the first half of 1979 from the year earlier period, the federal statistics office said.

With all calculations figured in terms of 1970 prices, the GNP growth rate compares with a rise of 4.1 percent posted in the 1978 second half from the year earlier and a rise of 2.9 percent in the 1978 first half. The corresponding growth rates recorded for the first and second halves of 1977 were 2.7 percent and 2.4 percent from their respective year-earlier periods.

.computed by quarters, real GNP rose by a marginal 1.7 percent in the first quarter of 1978 from the year-earlier and then posted gains of about 4 percent in the remaining three quarters of 1978 and the 1979 first quarter. The rate rose to yet another level in the second quarter of 1979 when it reached 4.4 percent.

Calculated in prevailing prices, the GNP rose by 8.3 percent in the 1979 first half from the year-earlier.

The 1979 first half was marked by a significant expansion of investment which grew at considerably higher rates than private and state spending. Calculated in prevailing prices, investment spending rose by 19.8 percent in the 1979 first half from the year-earlier, while spending grew by only 6.8 percent and state spending by only 7.8 percent.