Column name Explanation Area The country or area. Year The year. GDP per capita The GDP per capita, if any, for the specific country year. Measured in 2005 international dollars Type of data A summary of the method used to calulate the specific observation, e.g. whether it is based on cross country comparison (level) or the growth rate from year to year. Data period Often the same source is used for several years. In these cells you see what this period is. Sometimes there are missing observations or interpolations within this series. Longer description A longer description that sumarise information in several of the columns. These cells are only sporadically filled in. Growth linked to which year Whenever we use a series of growth rates we need to link these series to a specific year. In these cells this year is indicated. However, these cells has not been systematically filled in, so you find many missing values here. The default is to link it to the series that are one step closer to the year 2005. For example, a growth series for 1880-1950 for a specific country might be linked to another series for 1950-1970. The linking year would then be 1950. So, if nothing else is stated, this is the principle. Sometimes a growth series are linked to both a starting year and an ending year. In such cases the growth rate has to be adjusted so that it match both of the levels. If use region or neighbor - what is used: Sometimes we use data from regional averages, or from neighbouring countries. In these cells you find information on which region or country have been used. The regions are usually those used by Maddison on-line. In these cells you also sometimes find information on what year(s) has been used for extrapolated or interpolated observations. Source Here you find information on the sources that has been used for this partiular observation. The sources has been marked in a abbrevated form (e.g. the very cryptic abbrevation e1872). These are explained in the tab "sources" Source notes Some additional information about the sources and how they were used. Other notes Some other notes, typically giving additional information about how guesstimates were done. Adjustments of data Here you find infomration on the methods used to adjust the level of an observation. This typical refers to the regression models we used to transform cross-country data for 2005 to become more comparable to the ICP data (our main sourec for 2005). These models are called gapminder model 1, 2 or 4 and are described in the written documentation. Some cells have been marked with "no adjustments made", but I do not remember why I felt the urge to specifically mention it in these cases. Regional average multiplied with spread-ot factor Sometimes we assume that the country's level is similar to the regional average. We multiply this average with a "spread-ot factor". This is done to avoid that too many countries end up on exactly the same level. In this cell you find what this spreadout factor is. Other footnotes Here you find a variety of additional footnotes. Most notably you find information on what we based the "spread-out factor" on (often it is just random).