Выражение встречается в следующем контексте:
The secondary objectives were: ... to test the hypothesis that LY2062430 will slow the rate of decline associated with Alzheimer’s Disease as compared with placebo, for ADAS-Cog11 and for ADCS-ADL, each assessed using a slope analysis from a repeated-measures model.

Слово slope встречается еще вот в таком контексте:
Slopes of the 2 co-primary outcomes (ADAS-Cog11 and ADCS-ADL) will be assessed separately using an MMRM analysis.
To test for linearity, a quadratic slopes model will be fitted to the ADAS Cog11 and ADCS-ADL data separately.

Cпасибо!