Sandbox
Wikirating needs somebody who wants to update the economic data for the SWI. 
Last update: 20181222  Credit rating table 
Contents
Criteria
The Sovereign Wikirating Index (SWI) uses the following five criteria (with weights):
 Public debt (in % of the GDP) — 50% weight
 Account balance (in % of the GDP) — 20% weight
 GDP growth rate — 10% weight
 Inflation rate — 10% weight
 Unemployment rate — 10% weight
The resulting value is adjusted by multiplying it with a Scaling factor, which is composed by the Human Development Index (HDI)^{[1]} (60% weight), the Corruption Perceptions Index^{[2]} (20% weight) and the Political Instability Index^{[3]} (20% weight).
Calculations
Each criterium is calibrated with respect to the relative minimum and maximum value of all countries. For some criterion a threshold value is defined in order to avoid distorted values. The calculated values are done with a spreadsheet (wr_swi_method+data_20110926.xls).
Short Title  Long Title  Value  Weight  Real Min  Real Max  SWI Min  SWI Max 

HD  Human Development Index  Weighted index of development indicators  0.6  0  1  0  1 
CO  Corruption Perceptions Index  Index of perceived corruption  0.2  0  10  0  1 
PI  Political Instability Index  Index of political instability  0.2  0  10  0  1 
PD  Public Debt  Debt/GDP as %, reflects the economies ability to honour loans.  0.5  0  inf  15  90 
AB  Current Account Balance  Current account balance as % of GDP, reflects foreign inflows and outflows.  0.2  inf  +inf  20  20 
PG  GDP Growth  Domestic growth an an annual %  0.1  1  inf  0.1  0.1 
IR  Consumer Price Index  CPI as %  0.1  1  inf  0.02  0.2 
UR  Unemployment Rate  Rate of unemployment as %  0.1  0  1  0.03  0.3 
R  Rating  Result of SWI calculation  1  0  100  0  100 
Formula
<math>R = ({rR\min rR\over \max rR\min rR} \times 100) + (100nrR)\times {\max rRrR \over \max rR\min rR}</math>
Where: <math>rR=((PD\times wPD)+(AB\times wAB)+(PG\times wPG)+(IR\times wIR)+(UR\times wUR))\times SF</math>
Where: <math>SF=(HD\times wHD)+(CO\times wCO)+(PI\times wPI)</math>
General Variable Modifiers
For example, the variable AB.
 AB = Number used in calculations for SWI.
 rAB = Raw or real value, actual data from source in whichever format it is acquired.
 wAB = Weighting value for the data.
 minAB = Floor value of variable, will cause ABC to equal 0 or 100 if ABC is below this value.
 maxAB = Ceiling value of variable, will cause ABC to equal 0 or 100 if ABC is above this variable.
 nAB = Number of ratings (for rating)
So for instance, if the real value (rAB) was 4 on a 10 point scale, this would be divided by 10 to create the value for calculations (AB) which, in calculations, is multiplied by the weighting (e.g. 0.5 for 50% weight.)
Scaling Factor
 HD = <math>rHD</math>
 CO = <math>rCO\over 10</math>
 PI = <math>rPI\over 10</math>
General Formula
<math>100  {XX\min XX\over \max XX\min XX}\times 100</math>
Applies to: PD, AB, PG, IR, UR
List
 List of countries by credit rating (SWI)
 List of countries by credit rating  comparison with SWI method
References
