On 25/03/2015 12:30, Frederic Ntirenganya wrote:
Hi all,
I am doing analysis which involves fitting a line on trellis plot.
But the commands below (or at least the output from them) are not
plotting commands.
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.
Call:
lm(formula = curr_data[[tmin_col]] ~ curr_data[[year_col]] -
1 | curr_data[[month_col]])
It would be simpler to say
lm(tmin_col ~ year_col - 1 | month_col, data = curr_data)
What did you think this was going to do? Is there any mention in the
help for lm that you can use the | here?
It would also be helpful to see the result of str(curr_data) as we do
not know what year_col is and we need to be sure that month_col is
indeed a factor.
I am sure calendar experts on this list are readying themselves to
question your assertion that all calendars have twelve months but that
is rather off-topic.
Residuals:
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)
Regards,
Frederic.
Frederic Ntirenganya
Maseno University,
African Maths Initiative,
Kenya.
Mobile:(+254)718492836
Email: fr...@aims.ac.za
https://sites.google.com/a/aims.ac.za/fredo/
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