Model with no random intercept?
This seems like the right syntax, but it won't work correctly for categorical input variables. If epiPeriod is (e.g.) a two-level factor with levels "before","after" then you might want cslt_sspref ~ 1 + epiPeriod + (0+dummy(epiPeriod,"after")|ss_pref) (see ?dummy) -- although I have to say I am suspicious of the usefulness of this model ... why do you expect there to be no variation among groups in the "before" period ... ? Ben Bolker
On Thu, Oct 29, 2015 at 1:32 PM, Philipp Singer <killver at gmail.com> wrote:
Your syntax is correct, you need to specify it as cslt_sspref ~ 1 + epiPeriod + (0+epiPeriod|ss_pref) Best, Philipp On 10/29/2015 06:41 AM, Salmon, Ma?lle wrote:
Dear help-list, Is it possible to have a random effect without random intercept? My model is formula <- "cslt_sspref ~ 1 + epiPeriod + (epiPeriod|ss_pref)" modelTest1 <- glmer(formula, dataCarambars, family=poisson()) But what I would like is something like formula <- "cslt_sspref ~ 1 + epiPeriod + ((0+epiPeriod)|ss_pref)" modelTest1 <- glmer(formula, dataCarambars, family=poisson()) i.e. only epiPeriod with a random effect of ss_pref. I have tried different syntaxes with 0, -1, etc. but I could not find the right syntax. How can I avoid this issue and eliminate the random intercept? Maybe I cannot? Thanks a lot in advance, best wishes Ma?lle Salmon.
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