## Spearman Indicator

The Spearman Indicator is described by Dan Valcu in the Stocks and Commodities Magazine, February 2011. The indicator is named after Charles Spearman who was a British psychologist and mathematician of the late 19th and early 20th centuries. Spearman is a oscillator with values between +100 an -100. High plus values (+80) indicate an uptrend; high negative values (-80) represent a downtrend. A signal, which is a moving average of the Spearman, is also plotted. The user may change the input (close), method (SMA), period lengths and guide values. This indicator’s definition is further expressed in the condensed code given in the calculation below. ### How To Trade Using the Spearman Indicator

No trading signals are calculated for this indicator.

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### Calculation

//input = price, user defined, default is closing price
//method = moving average, user defined, default is SMA
//n = Spearman period, user defined, default is 10
//sigPeriod = signal period, user defined, default is 3

```size = series.size();
r1[] = new int[n+1];
r22[] = new int[n+1];
r11[] = new double[n+1];
r21[] = new double[n+1];
temp = 0;
coefcorr = 0, sc = 0;
changed = 0, found = 0;
absum = 0, ab = 0, ab2 = 0 ;

for (int k = n; k lessThan size; k++ )
for (int i = n; i moreOrEqual 1; i--)
r1[i] = i;
r22[i] = i;
r11[i] = series.getDouble((k - n + i), key, 0);
r21[i] = series.getDouble((k - n + i), key, 0);
endFor
//sort r21 descending
changed = 1;
while (changed moreThan 0)
changed = 0;
for (int i = 1; i lessOrEqual (n-1); i++)
if (r21[i+1] lessThan r21[i])
temp = r21[i];
r21[i] = r21[i + 1];
r21[i+1] = temp;
changed = 1;
endIf
endFor
endWhile
////
for (int i = 1; i lessOrEqual n; i++)
found = 0;
while (found lessThan 1)
for (int j = 1; j lessOrEqual n; j++)
if (r21[j] == r11[i])
r22[i] = j;
found = 1;
endIf
endFor
endWhile
endFor
/////////
absum = 0;
for (int i = 1; i lessOrEqual; i++)
ab = r1[i] - r22[i];
ab2 = ab * ab;
absum = absum + ab2;
endFor
coefcorr = 1 - ((6 * absum) / (n * ((n * n) - 1)));
Plot: sc = 100 * coefcorr;
Plot: sig = ma(method, k, sigPeriod, SC);
end```