Changes in NMC
Changes in version 5.0
Version 5.0 expands the data to 2012 and adds additional documentation of data sources.
Changes in version 4.0
Version 4.0 expands the data to 2007. In addition, the subcomponent data points are now maintained in .csv format and in a single file for greater convenience.
Changes in version 3.02
Version 3.02 corrects component values for Singapore's population and energy statistics from 1965-2001. First, some prior energy values were underestimated due to the availability of limited data, which have now been updated (and new backwards extrapolation applied). Second, due to using midyear and end-of-year sources, Singapore's urban population sometimes appearead greater than its total population (it is 100% urban). These values were corrected. In addition, data were added for Tuvalu, Kiribati, Tonga, and Nauru (data was missing in v3.01) from 1999-2001. Overall CINC scores were then recomputed for all states in the database; most changed in the 4th decimal place. The main documentation was also slightly updated at this time (simply to list the capability units used in the main data set).
Change in version 3.01
Version 3.01 changes one (and only one) component value of the 72,000 country-year-values, namely Russia's value for military personnel in 2000. This entry had a typo (15200 as opposed to the correct 1004). This one change has an important effect on Russia's CINC score in 2000 (lowering it from .11 to .05).
Changes in version 3.0
Version 3.0 makes a number of changes to the component data within the data set, although the final correlation of CINC scores to CINC scores computed using version 2.1 is extremely high (r=0.99). Construction of version 3.0 of the capabilities data set has included both an update of each time series to 2001 and a thorough revisiting of some of the individual component series. In particular:
-The Military Personnel Data Set was both updated and modified. It was modified from previous versions by using U.S Arms Control and Disarmament Agency (ACDA) data for all data points from 1961 forward when possible. This solitary data source makes the data more comparable both cross-nationally and longitudinally.
-The Iron and Steel Data Set was both updated and modified. Project researchers went back through the data set and re-confirmed the data points, re-documenting the sources for all data points in the series.
-The Primary Energy Consumption Data Set was completely re-constructed for version 3.0. All data points were re-calculated from raw data sources, and compiled into a total energy consumption data value for each state in a given year.
-The Total Population Data Set was first updated using United Nations data. Then researchers went back through the data set, re-documenting the data points; some data series were replaced, and some interpolations were re-calculated.
As part of extending and modifying the data set, project researchers have also fully documented as many data points as possible within a set of larger computer databases for each component, and created new "quality" and "anomaly" codes within the individual component sets. These codes mark data points for which we have greater or lower confidence in the accuracy of the point, and mark unexplained jumps or declines in the data values that may indicate measurement problems. We anticipate releasing these component data bases in the future.
Version 1.0 of the NMC data, which covers the period 1816-1985, may be obtained from the Inter-university Consortium for Political and Social Research (ICPSR) as study number 9903 (National Material Capabilities Data, 1816-1985 ). The abstract of the data set may be viewed by clicking here.