v0.6.12

StatsModels v0.6.12

Diff since v0.6.11

Closed issues:

• Shifted columns? (#180)

Merged pull requests:

• Add lrtest (#162) (@nalimilan)
• Fix tests with DataFrames 0.21 (#179) (@nalimilan)
• use DataAPI.levels instead of levels field on contrasts, terms as hints (#181) (@kleinschmidt)
• bump patch version to 0.6.12 (#184) (@kleinschmidt)