include bkfilter load gdp series logy = log(gdp) ' Eviews 5 built-in band pass filter function 'logy.bpf(type = bk, low = 6, high = 32, lag = 12) ybp scalar n = @obsrange scalar up = 6 scalar dn = 32 scalar k = 12 series ybk call bkfilter(logy, ybk, n, up, dn, k)