// multi-utility computation suite · offline · instant · precise
┌──────────────────────────┐
│ [c] calcalyst_ │
│ computation suite │
└──────────────────────────┘
// select a module to initialize
/ search↵ open firstesc close
// adsenseEMPTY_LEADER_SLOT728×90
// keyboard shortcuts
/focus search
Escclear search · close calc
Enteropen first result
↑↓navigate list
?toggle this panel
// adsenseMOBILE_ANCHOR_SLOT320×50
// keyboard_shortcuts
/focus search
↑↓navigate module list
Enter
open first result from search
open highlighted
compute when module is open
compute when focused in a field
Escclose module · clear selection
⌫
sci.gravity-model-trade Calculator
Calculates bilateral trade volume from GDP and distance using the gravity model: Trade = G × GDP_i^α × GDP_j^β / Distance^γ. Gravity model explains 50–70% of variance in bilateral trade — each 1% increase in distance reduces trade by ~1% (γ ≈ 1).
Inputs
Gdp A Bn
Reference formula or conversion factor shown for context.
Gdp B Bn
Reference formula or conversion factor shown for context.
Distance Km
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Alpha
Reference formula or conversion factor shown for context.
Beta
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Results
trade flow index T
A normalised score comparing the result to a reference baseline.
ln(T) (log trade index)
A normalised score comparing the result to a reference baseline.
GDP elasticity of trade
Reference formula or conversion factor shown for context.
distance elasticity of trade
The computed distance or separation.
T = (Ya^α × Yb^α) / d^β
Reference formula or conversion factor shown for context.
interpretation
Qualitative summary of what the computed numbers mean in practical terms.