This is Dataplot data file SUNSPOT2.DAT Yearly sunspot activity Date--May 20, 1977 Reference--Munrow, Ella H., Tables on Sunspot Frequency for 1749-1947: Terrestial Magnetism and Atmospheric Electricity. An International Quarterly Journal, Volume 53, 1948, Pages 241-245. Reference--Granger, C. W. and Hatanaka, M. Spectral Analysis of Economic Time Series, Princeton Univeristy Press, 1964, pages 64-66. Reference--Morris, J. Forecasting the Sunspot Cycle, Journal of the Royal Statistical Society, A, Volume 140, Part 3, 1977. Number of observations = 199 Number of variables per line image = 2 Order of variables on a line image-- 1. Response variable = average Wold monthly sunspot number 2. Factor 1 = year (1749 to 1947) To read this file into Dataplot-- SKIP 25 READ SUNSPOT2.DAT Y X Y X Sunspot Year Number ---------------- 80.9 1749 83.4 1750 47.7 1751 47.8 1752 30.7 1753 12.2 1754 9.6 1755 10.2 1756 32.4 1757 47.6 1758 54.0 1759 62.9 1760 85.9 1761 61.2 1762 45.1 1763 36.4 1764 20.9 1765 11.4 1766 37.8 1767 69.8 1768 106.1 1769 100.8 1770 81.6 1771 66.5 1772 34.8 1773 30.6 1774 7.0 1775 19.8 1776 92.5 1777 154.4 1778 125.9 1779 84.8 1780 68.1 1781 38.5 1782 22.8 1783 10.2 1784 24.1 1785 82.9 1786 132.0 1787 130.9 1788 118.1 1789 89.9 1790 66.6 1791 60.0 1792 46.9 1793 41.0 1794 21.3 1795 16.0 1796 6.4 1797 4.1 1798 6.8 1799 14.5 1800 34.0 1801 45.0 1802 43.1 1803 47.5 1804 42.2 1805 28.1 1806 10.1 1807 8.1 1808 2.5 1809 .0 1810 1.4 1811 5.0 1812 12.2 1813 13.9 1814 35.0 1815 45.0 1816 41.1 1817 30.4 1818 23.9 1819 15.7 1820 6.6 1821 4.0 1822 1.8 1823 8.5 1824 16.6 1825 36.3 1826 49.7 1827 62.5 1828 67.0 1829 71.0 1830 47.8 1831 27.5 1832 8.5 1833 13.2 1834 56.9 1835 121.5 1836 138.3 1837 103.2 1838 85.8 1839 63.2 1840 36.8 1841 24.2 1842 10.7 1843 15.0 1844 40.1 1845 61.5 1846 98.5 1847 124.0 1848 95.9 1849 66.5 1850 64.5 1851 54.2 1852 39.0 1853 20.6 1854 6.7 1855 4.3 1856 22.8 1857 54.8 1858 93.8 1859 95.7 1860 77.2 1861 59.1 1862 44.0 1863 47.0 1864 30.5 1865 16.3 1866 7.3 1867 37.3 1868 73.9 1869 139.1 1870 111.2 1871 101.7 1872 66.3 1873 44.7 1874 17.1 1875 11.3 1876 12.3 1877 3.4 1878 6.0 1879 32.3 1880 54.3 1881 59.7 1882 63.7 1883 63.5 1884 52.2 1885 25.4 1886 13.1 1887 6.8 1888 6.3 1889 7.1 1890 35.6 1891 73.0 1892 84.0 1893 78.0 1894 64.0 1895 41.8 1896 26.2 1897 26.7 1898 12.1 1899 9.5 1900 2.7 1901 5.0 1902 24.4 1903 42.0 1904 63.5 1905 53.8 1906 62.0 1907 48.5 1908 43.9 1909 18.6 1910 5.7 1911 3.6 1912 1.4 1913 9.6 1914 47.4 1915 55.4 1916 103.9 1917 80.6 1918 63.6 1919 37.6 1920 26.1 1921 14.2 1922 5.8 1923 16.7 1924 44.3 1925 63.9 1926 69.0 1927 77.8 1928 65.0 1929 35.7 1930 21.2 1931 11.1 1932 5.7 1933 8.7 1934 36.1 1935 80.4 1936 114.4 1937 109.6 1938 88.8 1939 67.8 1940 47.5 1941 30.6 1942 16.3 1943 9.6 1944 33.2 1945 92.6 1946 151.6 1947