Williams Accumulation/Distribution Technical Analysis Indicator: wad

Function Prototype

/* Williams Accumulation/Distribution */
/* Type: indicator */
/* Input arrays: 3    Options: 0    Output arrays: 1 */
/* Inputs: high, low, close */
/* Options: none */
/* Outputs: wad */
int ti_wad_start(TI_REAL const *options);
int ti_wad(int size,
      TI_REAL const *const *inputs,
      TI_REAL const *options,
      TI_REAL *const *outputs);

Description

This documentation is still a work in progress. It has omissions, and it probably has errors too. If you see any issues, or have any general feedback, please get in touch.

Williams Accumulation/Distribution can help determine trend direction.

It is calculated for each bar as:

$$ad_{t} = \begin{cases} close_{t} - min(close_{t-1}, low_{t}) & \mathrm{if} \; close_{t} > close_{t-1} \\ close_{t} - max(close_{t-1}, high_{t}) & \mathrm{if} \; close_{t} \lt close_{t-1} \\ 0 & \mathrm{else} \end{cases} $$

$$wad_{t} = wad_{t-1} + ad_{t}$$

References

Achelis, S. (2000) Technical Analysis from A to Z, 2nd Edition

Example Usage

Calling From C

/* Example usage of Williams Accumulation/Distribution */
/* Assuming that 'high', 'low', and 'close' are pre-loaded arrays of size 'in_size'. */
TI_REAL *inputs[] = {high, low, close};
TI_REAL options[] = {}; /* No options */
TI_REAL *outputs[1]; /* wad */

/* Determine how large the output size is for our options. */
const int out_size = in_size - ti_wad_start(options);

/* Allocate memory for output. */
outputs[0] = malloc(sizeof(TI_REAL) * out_size); assert(outputs[0] != 0); /* wad */

/* Run the actual calculation. */
const int ret = ti_wad(in_size, inputs, options, outputs);
assert(ret == TI_OKAY);

Calling From Lua (with Tulip Chart bindings)

-- Example usage of Williams Accumulation/Distribution
wad = ti.wad(high, low, close)

Example Calculation

date	high	low	close	wad
2005-11-01	82.15	81.29	81.59
2005-11-02	81.89	80.64	81.06	-0.83
2005-11-03	83.03	81.31	82.87	0.98
2005-11-04	83.30	82.65	83.00	1.33
2005-11-07	83.85	83.07	83.61	1.94
2005-11-08	83.90	83.11	83.15	1.19
2005-11-09	83.33	82.49	82.84	0.70
2005-11-10	84.30	82.30	83.99	2.39
2005-11-11	84.84	84.15	84.55	2.95
2005-11-14	85.00	84.11	84.36	2.31
2005-11-15	85.90	84.03	85.53	3.81
2005-11-16	86.58	85.39	86.54	4.96
2005-11-17	86.98	85.76	86.89	6.09
2005-11-18	88.00	87.17	87.77	6.97
2005-11-21	87.87	87.01	87.29	6.39

Chart

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Williams Accumulation/Distribution

Technical Analysis Indicator: wad