[R] Fitting a line on trellis plot

Frederic Ntirenganya ntfredo at gmail.com
Wed Mar 25 13:30:36 CET 2015

Hi all,

I am doing analysis which involves fitting a line on trellis plot. The
factor is month. As you know a year has 12 months and I expect to get
12 lines one for each month. I am getting the following results which
is different to my expectation. Am I have to do anything about the
data? Any suggestion is welcome. Thanks.

lm(formula = curr_data[[tmin_col]] ~ curr_data[[year_col]] -
    1 | curr_data[[month_col]])

    Min      1Q  Median      3Q     Max
-5.0625 -0.7625  0.0375  0.9375  4.9375

Coefficients: (1 not defined because of singularities)
                                                       Estimate Std.
Error t value Pr(>|t|)
(Intercept)                                            15.56254
0.01079    1442   <2e-16 ***
curr_data[[year_col]]  | curr_data[[month_col]]TRUE       NA
NA      NA       NA
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 1.327 on 15115 degrees of freedom
  (72 observations deleted due to missingness)



Frederic Ntirenganya
Maseno University,
African Maths Initiative,
Email: fredo at aims.ac.za

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