Comparison between mock catalogues with a sampling rate of 100% and without gaps (red triangles), and with a sampling rate and gaps as in VIPERS (blue triangles). The subsamples are limited at M_B(z = 1.1) − 5log (h) ≤ −20.5. From top to bottom: volume-averaged two-, three-, and four-point correlation functions, normalized skewness S₃ and kurtosis S₄ in redshift space. First column: 0.5 ≤ z< 0.7; second column: 0.7 ≤ z< 0.9; third column: 0.9 ≤ z< 1.1.