[R] difference in results from R vs SPSS

[Fiona Sammut]

Thanks for the reply.  The mistake in 1 resulted to be due to using a 
different number of decimal places in the data. 

As regards 2, will check it out again.

Thanks again.

> Fiona Sammut wrote:
>> Hi all,
>>
>> 1.  I am doing some data analysis using both R and SPSS, to get used 
>> to both software packages.  I had performed linear regression in R 
>> and SPSS for a number of times before this last one and the resulting 
>> coefficient values always matched.  However, this last data set I was 
>> analyzing using simple linear regression and using the command 
>> lm(y~x), gave me different readings from R and SPSS:
>>
>> R:                y= 33.803 + 6.897x
>>
>> SPSS:             y= 47.589 + 6.263x
>>
>> I have no doubts regarding the procedure employed in SPSS and I am 
>> sure I am using the same dataset for both software packages.
>
>   My guess is you have missing values defined in SPSS but don't have 
> those same values set to NA in R.  Have you requested basic 
> descriptive statistics in both programs and found that they match?  
> Also, perhaps x a factor in R.  If so, how are its contrasts set?
>
>> 2.  Correct me if I am wrong, but from what I've read, it seems that 
>> the command /anova /in R works out an analysis of variance without 
>> including the intercept.  Is that so?  Cause again I am working out 
>> an anova in R and SPSS and I got different resulting sums of squares 
>> and different degrees of freedom.  I thought this was because one 
>> package is working with an intercept and the other isn't.
>
>   I don't think this has anything to do with the discrepancy.
>
>> Can anyone enlighten me as to what might have happened in both 1. and 
>> 2. please?  Are they both due to my poor knowledge of R or could 
>> occurences as above happen?
>>
>>
>> 3.  I would like a reference to a command which can be used to fit a 
>> distribution to a disrete distribution.
>
> library(MASS)
> ?fitdistr
>
>> Thanks in advance for your consideration.
>>
>> - Fiona Sammut
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