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spark-analysis's Issues

Question about QQ plot?

I am new in bioinformatics, and I do not understand "Quantile-quantile plot" well in your paper.Could you please provide the code about it (Figure 2a) ? Thanks very much.

Question about simulated data

Hi! Thanks for the cool software. I downloaded the example simulated data from processed_data/sim_MOB_pattern2_fc3_tau35_count_power1.csv and when I ran SpatialDE and SPARK on the data, I got 0 (SpatialDE) and 112 (SPARK) significant genes at qval < 0.05. Is this (a single replicate of) the same data used for figure 1c/the expected result? If I understand the plot correctly, it seems that at FDR = 0.05, more genes should be recovered.

Code for spatialDE

counts = pd.read_csv("../SPARK-Analysis/processed_data/sim_MOB_pattern2_fc3_tau35_count_power1.csv", index_col = 0)
counts = counts.T[(counts > 0).sum(0) >= 3].T

x, y = zip(*[pos.split('x') for pos in counts.index])
sample_info = pd.DataFrame({
    'x': np.array(x).astype(float), 
    'y': np.array(y).astype(float), 
    'total_counts': counts.sum(1)
})

norm_expr = NaiveDE.stabilize(counts.T).T
resid_expr = NaiveDE.regress_out(sample_info, norm_expr.T, 'np.log(total_counts)').T

X = sample_info[['x', 'y']]
results = SpatialDE.run(X, resid_expr)

(results.qval < 0.05).sum() # returns 0

Code for SPARK

countdata <- read.csv("../SPARK-Analysis/processed_data/sim_MOB_pattern2_fc3_tau35_count_power1.csv", row.names = 1)

rn <- row.names(countdata)
info <- cbind.data.frame(x = as.numeric(sapply(strsplit(rn, split = "x"), "[", 1)), 
                         y = as.numeric(sapply(strsplit(rn, split = "x"), "[", 2)))
rownames(info) <- row.names(countdata)

spark <- CreateSPARKObject(counts = t(countdata), location = info[,1:2], 
    percentage = 0.1, min_total_counts = 10)
spark@lib_size <- apply(spark@counts, 2, sum)

spark <- spark.vc(spark, covariates = NULL, lib_size = spark@lib_size, 
    num_core = 1, verbose = T, fit.maxiter = 500)
spark <- spark.test(spark, check_positive = T, verbose = T)

spark <- spark.test(spark, check_positive = T, verbose = F)

sum(spark@res_mtest$adjusted_pvalue < 0.05) # returns 102

Question about simulation data

Hi, thank you for such an excellent SPARK software!

I'm currently working on spatial transcriptomic data, and want to use SPARK for some analysis. I checked the analysis steps you gave in github, and am very interested in the analysis of simulated data.

But when I looked through the "simulation/simulation_mouse_ob.R" file in it, I couldn't find the "Rep11_MOB_spark.rds" file used in the Data Generation and Noise Change steps.

Perhaps, would it be convenient to tell me how to get this rds file, or how this file is generated? It would be nice if you could provide a bit more information on the simulation steps.

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