search for: c_i

Dear all, I would be grateful if anyone can help me with the following: My aim is to compute explicitely the sum S=A+B where A=sum(exp(c_i/d)), i=1,...,n; B, c_i, and d are real numbers with -Inf<B,c_i<+Inf; and d>0. The problem is that when c_i/d >710 (for some i) R is setting exp(c_i/d) to be equal to +Inf and hence the whole summation S. So in simple cases where for example c_i=8 (for some i), and d=0.01 the whole summa...

Hi, I have a right-censored (positive) random variable (e.g. failure times subject to right censoring) that is observed for N subjects: Y_i, I = 1, 2, ..., N. Note that Y_i = min(T_i, C_i), where T_i is the true failure time and C_i is the censored time. Let us assume that C_i is independent of T_i. Now, I would like to generate another random variable U_i, I = 1, 2, ..., N, which is correlated with T. In other words, I would like to generate U from the conditional distribution [...

...... 0 0 1 0 ... 0 0 0 1 ... 0 . . . ... 0 . . . ... 0 . . . ... 0 0 0 0 ... 1 and c_i as (-1,0,...,0). Then whatever value \beta_0 takes, the first value of u_i%*%theta_i is always zero, which automatically is larger than -1. That is how I construct u_i and c_i. contrOptim returns the barrier.value. I am wondering whether the value corresponds to -1*\mu*(\sum_{i=1}^p log(\hat{\b...

...manual ... WARNING LaTeX errors when creating PDF version. This typically indicates Rd problems. LaTeX errors found: ! Missing $ inserted. <inserted text> $ l.682 }{} ! Missing } inserted. <inserted text> } l.682 }{} ... The line appears to be \widehat{R_1} = \frac{\sum\limits_{i=1}^n{c_i/n}}{\sum\limits_{i=1}^n{L_i/n}} I asked for assistance in resolving this issue as I could not replicate the WARNING. Another user could replicate the warning on Ubuntu 12.04 but was able to resolve the issue by removing the DOS end-of-line markers (^M or Ctrl-M) from the .Rd file. Neither he nor...

Hi all, I am doing some experiment studies... It seems to me that with different combination of 5 parameters, the end results ultimately converged to two scalars. That's to say, some combinations of the 5 parameters lead to one end result and some other combinations of the 5 parameters lead to the other end result (scalar). I am thinking of this is sort of something like clustering or

Dear All, I would like to generate m positive real numbers c_i, I=1,...,m, such that (1) c_1 + c_2 + ... + c_m=m, (1) after being ordered into c_1 >= c_2 >= .... >=c_m>0, we have that c_m is of the same order of m^(-1/8), when m is sufficiently large. Thanks, -Chee [[alternative HTML version deleted]]

I'm a programmer, not a mathmatician. I heard about R, and I'm wondering if anyone can tell me if there is an existing R function that can help with a problem we're currently trying to find an algorithm for. If R is not the answer, but you can recommend a known algorithm, that would help a lot! I'm on a project in a retail corporation, working on a program to assist retail buyers

...Each row in the above data frame represent the segment and each segment contain two-mixture component. (Latter I will increase the segment and the mixture component) So for every segment with n mixture component I have to find the *max f(x) with ?infinity < x < infinity* *f(x)=sum_i c_i N(O,mu_i,sigma_i). * *Since i need to calculate the derivate f? and set f?(x)=0 I thought of using Newton method * *In R the function I selected for my problem is optim.* *Below is my code * *l = 2 # represent the number of mixture component* *i=1# represent the segment 1 if i=2 r...

Hi all, I am working for nest box occupancy data for birds and would like to construct a Markov transition matrix, to derive transition probabilities for ALL years of the study (not separate sets of transition probabilities for each time step). The actual dataset I'm working with is 125 boxes over 14 years that can be occupied by 7 different species, though I have provided a slimmed down

...looking for an implementation of CART and random forest and therefore I am now studying R. I tested with rpart and randomForest package, they are quite good. However, I need a classification tree and for each training data, there is different loss. (i.e. the loss function is not purely 0-1, say, c_i > 0 for each training data) I read the document of randomForest and found that there are no such parameter, and then I move to rpart package to check if I can do it and perform the bagging process by myself. I found that there is a "weights" parameter for rpart. Is it the one that...

...steps: 1. Obtain the cumulative hazard function for each subject. 2. Choose an arbitrary value for the variance parameter of the frailties (call it theta). 3. Compute for each subject an estimate of the value of their frailties, USING this variance parameter theta: frailty_i= \frac(1+\theta \times c_i}{1+\theta \times H_i} (formula on p. 321), where H is the cumulative hazard for the subject. So if theta is 0 (no variance), then frailty=1 (i.e., no excess frailty). As theta goes to infinity, the estimated frailty is simply the ratio 1/(cumulative risk so far) or 1/(cumulative risk so far), depen...

...when creating PDF version. | This typically indicates Rd problems. | LaTeX errors found: | ! Missing $ inserted. | <inserted text> | $ | l.682 }{} | ! Missing } inserted. | <inserted text> | } | l.682 | }{} | ... | | The line appears to be | \widehat{R_1} = | \frac{\sum\limits_{i=1}^n{c_i/n}}{\sum\limits_{i=1}^n{L_i/n}} | | I asked for assistance in resolving this issue as I could not replicate the | WARNING. Another user could replicate the warning on Ubuntu 12.04 but was | able to resolve the issue by removing the DOS end-of-line markers (^M or | Ctrl-M) from the .Rd file. Neit...

...rent scripting implementation in use. If no implementation is in + * use (the default), %NULL is returned. + * + * Returns: the current scripting implementation used or %NULL if none + **/ +SwfdecPlayerScripting * +swfdec_player_get_scripting (SwfdecPlayer *player) +{ + g_return_val_if_fail (SWFDEC_IS_PLAYER (player), NULL); + + return player->priv->scripting; +} + +/** + * swfdec_player_set_scripting: + * @player: a #SwfdecPlayer + * @scripting: the scripting implementation to use or %NULL to disable scripting + * + * Sets the implementation to use for external scripting in the given @p...

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