Edited sentence: 1934 is.A large jump in data was noticed around the year 2000 of NASA's U.According to the new data published by NASA, 1998 is no longer the hottest year ever in the United States.He concluded the large jump was probably the result of a programming error.McIntyre had to reverse engineer the process by comparing the raw data and the processed data.McIntyre sent an email to NASA GISS advising of the problem affecting data from the years 2000-2007.NASA acknowledges the problem  and promptly web published reranked U.NASA does not fully publish the computer source code and formulae used to calculate the trends in the graph, nor the correction used to arrive at the "corrected" data.NASA has not explained the changes to data prior to 2000.Stephen McIntyre began to investigate the data and the methods used to arrive at the results that were graphed by NASA's Goddard Institute for Space Studies (GISS).The old data can be found here.and the new data here.temperature anomalies.temperature data