In statistical practice graphics with uniform scales are most often applied. On abscissa axis they undertake in proportion to number of the periods of time, and on ordinate axis – in proportion to levels. Length of the piece taken for unit will be the scale of a uniform scale.
productions of meat it falls on April, May, then its slow increase by August, sharp rise in September, October and again recession in December, January is observed. If as base for counting to take not the center of a circle, but a circle, charts are called spiral.